PR_26179_OWNER_011-pr-branching-model-docs

dev/build/ProjectInstructions/TEAM_START_COMMANDS.md

@@ -8,13 +8,15 @@ Official Start of Day command format lives in:
 
 The ready-to-copy team assignment commands below are OWNER assignment helpers, not Start of Day bootstrap commands.
 
-No team creates a PR branch until all checks pass:
+For Independent PRs and for the first PR in a new stacked workstream, no team creates a PR branch until all checks pass:
 
 - Current branch: `main`
 - Worktree: clean
 - `main...origin/main`: `0 0`
 - `HEAD` SHA matches the published EOD SHA
 
+Dependent Stacked PRs may start from the documented previous PR branch only when `dev/build/ProjectInstructions/addendums/pr_workflow.md` defines the direct dependency and merge order.
+
 Use `dev/build/ProjectInstructions/` as the only active Project Instructions source.
 Read `dev/build/ProjectInstructions/addendums/team_backlog_sod_eod_standard.md` before implementation.
 

dev/build/ProjectInstructions/addendums/branch_context_governance.md

@@ -23,6 +23,8 @@ At the start of work, report or validate:
 - active team
 - active assignment
 - active PR number/name or explicit `PLAN_ONLY`
+- requested PR branching model: Independent PR or Stacked PR
+- expected starting branch for the requested PR branching model
 - previous PR Closed status unless this is an explicitly documented stacked PR chain
 
 Session start must follow the canonical START phase in `dev/build/ProjectInstructions/addendums/project_instructions_single_source_eod_lock.md`.
@@ -32,12 +34,14 @@ Session start must follow the canonical START phase in `dev/build/ProjectInstruc
 Stop and report before changing files when:
 
 - current branch does not match the expected branch
+- requested PR branching model does not match the current/start branch
 - local branch is behind or ahead unexpectedly
 - worktree has unrelated changes
 - active assignment is missing or unclear
 - active team does not match the branch or OWNER instruction
 - BUILD_PR work has no PR name and active branch/PR identity, unless explicitly marked `PLAN_ONLY`
 - the team's previous PR is not Closed and no stacked PR chain is documented
+- the request describes a Stacked PR but does not document the dependency order
 - the requested work would modify files outside the approved scope
 
 ## Continuation Rule

dev/build/ProjectInstructions/addendums/branch_lock_governance.md

@@ -26,9 +26,12 @@ This file owns branch lock enforcement and OWNER override handling; it must not
 
 ## Branch Rules
 
-- Start from current `main`.
-- Pull latest `origin/main` before creating a work branch.
-- Do not create a PR branch unless current branch is `main`, worktree is clean, `main...origin/main` is `0 0`, and `HEAD` SHA matches the published EOD SHA.
+- Identify the PR branching model before creating or continuing a PR branch.
+- Independent PRs and new stacked workstreams start from current `main`.
+- Dependent Stacked PRs may start from the documented previous PR branch only when a direct dependency and dependency order are documented in `dev/build/ProjectInstructions/addendums/pr_workflow.md`.
+- Pull latest `origin/main` before creating an Independent PR branch or the first branch in a new stack.
+- Do not create an Independent PR branch unless current branch is `main`, worktree is clean, `main...origin/main` is `0 0`, and `HEAD` SHA matches the published EOD SHA.
+- HARD STOP if the current branch does not match the requested PR branching model.
 - Follow the canonical START / WORK / END lifecycle in `dev/build/ProjectInstructions/addendums/project_instructions_single_source_eod_lock.md`.
 - Keep work on the active branch until the PR is merged, the branch is retired, EOD closeout begins, or OWNER says to return to `main`.
 - For OWNER-approved stacked/sequential workstreams, PR branches/commits stay on the active team branch/workstream during the day and do not return to `main` between PRs.

dev/build/ProjectInstructions/addendums/pr_workflow.md

@@ -19,22 +19,69 @@ This file owns PR lifecycle governance. It must not duplicate command phase rule
 
 ## Standard Flow
 
-1. Start from main.
-2. Pull latest origin/main.
-3. Verify clean worktree.
-4. Create a PR branch and PR identity.
-5. Mark lifecycle state as PR Open.
-6. Plan on the same PR branch.
-7. Build on the same PR branch.
-8. Validate the change.
-9. Commit with a clear OWNER/team message.
-10. Push the branch.
-11. Open or update the draft PR.
-12. Review the PR.
-13. OWNER approves merge.
-14. Merge to main.
-15. Pull latest main before starting the next unrelated workstream, or before a new PR when the work is not an OWNER-approved stacked/sequential workstream.
-16. Verify Main Verified and Closed gates.
+1. Identify the PR branching model: Independent PR or Stacked PR.
+2. Start from the required branch for that model.
+3. Pull or confirm the required base branch is current.
+4. Verify clean worktree.
+5. Create a PR branch and PR identity.
+6. Mark lifecycle state as PR Open.
+7. Plan on the same PR branch.
+8. Build on the same PR branch.
+9. Validate the change.
+10. Commit with a clear OWNER/team message.
+11. Push the branch.
+12. Open or update the draft PR.
+13. Review the PR.
+14. OWNER approves merge.
+15. Merge to main in the valid order for the PR model.
+16. Pull latest main before starting the next unrelated workstream, or before a new PR when the work is not an OWNER-approved stacked/sequential workstream.
+17. Verify Main Verified and Closed gates.
+
+## PR Branching Models
+
+Every PR must declare one branching model before branch creation or branch continuation.
+
+### Independent PR
+
+Use an Independent PR when the change has no direct dependency on another open PR.
+
+Rules:
+- Independent PRs must start from synchronized `main`.
+- Independent PRs must target `main`.
+- Independent PRs must not reuse another feature branch as their starting point.
+- Codex must HARD STOP if the requested Independent PR starts from any branch other than `main`.
+- Codex must return to synchronized `main` before starting the next unrelated Independent PR.
+
+### Stacked PR
+
+Use a Stacked PR only when the PR has a direct dependency on the previous PR branch.
+
+Rules:
+- Stacked PRs may start from the previous PR branch when there is a direct dependency.
+- Stacked PRs must document the dependency order before BUILD begins.
+- Stacked PR reports must name:
+  - the stack order
+  - the previous PR dependency
+  - the next PR dependency, if known
+  - the starting branch
+  - the intended merge order
+- Stacked PRs must be reviewed in dependency order.
+- Stacked PRs must be merged in dependency order.
+- A later stacked PR must not merge before every prior dependency PR is merged.
+- Codex must HARD STOP if the requested Stacked PR starts from a branch that is not the documented previous PR branch.
+- Codex must HARD STOP if a Stacked PR lacks a documented dependency order.
+
+### Model Mismatch Hard Stop
+
+Codex must verify the requested PR model before changing files.
+
+HARD STOP when:
+- an Independent PR is requested but the current/start branch is not `main`
+- a Stacked PR is requested but the current/start branch is not the documented previous PR branch
+- the request does not say whether the PR is Independent or Stacked and the start branch is not clearly valid
+- a PR is described as stacked but no direct dependency or merge order is documented
+
+When the model is unclear, Codex must report the current branch, expected starting branch, and the missing model/dependency information before making changes.
 
 ## Daily Branch Workflow
 
@@ -109,7 +156,7 @@ Closed gates:
 - Plan, Build, validation, reports, ZIP packaging, and closeout must stay tied to the same PR identity and source branch.
 - Source branches are retained by default after merge and closeout.
 - Do not mix unrelated scopes.
-- Do not start dependent PRs until the required base PR is merged.
+- Do not start dependent PRs until the required base PR is merged unless the work is an explicitly documented Stacked PR with a direct dependency on the previous PR branch.
 - Return to `main` before starting an unrelated PR or new workstream.
 - Do not return to `main` between PRs in the same OWNER-approved stacked/sequential workstream unless OWNER approves an EOD or intermediate merge checkpoint.
 - A team must not begin another PR if its previous PR is not Closed.

dev/build/ProjectInstructions/addendums/project_instructions_single_source_eod_lock.md

@@ -47,13 +47,15 @@ git rev-parse HEAD
 
 ## Team Branch Creation Gate
 
-No team creates a PR branch until:
+For Independent PRs and for the first PR in a new stacked workstream, no team creates a PR branch until:
 - Current branch: `main`
 - Worktree: clean
 - `main...origin/main`: `0 0`
 - `HEAD` SHA matches published EOD SHA
 
-If any check fails, stop before branch creation and restore main to the published EOD state or request OWNER direction.
+For dependent Stacked PRs, the start branch may be the documented previous PR branch only when `dev/build/ProjectInstructions/addendums/pr_workflow.md` identifies a direct dependency and dependency order.
+
+If any required check fails, or if the current branch does not match the requested PR model, stop before branch creation and restore the expected branch state or request OWNER direction.
 
 ## Branch Lifecycle (Canonical)
 
@@ -90,7 +92,7 @@ main...origin/main
 HEAD equals published EOD SHA
 ```
 
-Only after ALL four pass may a branch be created or the active team branch/workstream be updated.
+Only after ALL required checks for the requested PR branching model pass may a branch be created or the active team branch/workstream be updated.
 
 Create the PR branch:
 

dev/build/ProjectInstructions/standards/CODEX_WORKFLOW_COMMANDS.md

@@ -101,6 +101,8 @@ PLAN_PR is planning only.
 Rules:
 - Do not change files unless the user explicitly requests a planning artifact update.
 - Identify the correct branch or start point.
+- Identify whether the PR is Independent or Stacked.
+- For Stacked PRs, identify the previous PR branch and dependency order.
 - Identify the intended PR name, purpose, and scope.
 - Identify required validation and reporting.
 - Identify the required ZIP outcome path from the Codex Completion Contract.
@@ -113,12 +115,14 @@ BUILD_PR is the implementation phase.
 
 Rules:
 - Verify branch and worktree rules for the PR before changing files.
+- Verify the requested PR branching model before changing files.
 - Use the latest Project Instructions.
 - Stay inside the approved PR purpose.
 - Create required reports.
 - Create the required repo-structured ZIP artifact for the attempted PR according to the Codex Completion Contract.
 - Run scoped validation required by the PR and Project Instructions.
 - HARD STOP on wrong branch.
+- HARD STOP when the current/start branch does not match the requested Independent or Stacked PR model.
 - HARD STOP on dirty worktree when the PR requires a clean start.
 - HARD STOP on scope conflict.
 - HARD STOP on missing required Project Instructions.

dev/reports/PR_26179_OWNER_011-pr-branching-model-docs_branch-validation.md

@@ -0,0 +1,15 @@
+# PR_26179_OWNER_011-pr-branching-model-docs Branch Validation
+
+## Result
+
+PASS
+
+## Checks
+
+| Check | Result | Notes |
+| --- | --- | --- |
+| Started from `main` | PASS | `main...origin/main` was `0 0`. |
+| Worktree clean before branch creation | PASS | Verified before branch creation. |
+| PR branch created | PASS | `PR_26179_OWNER_011-pr-branching-model-docs`. |
+| Work stayed on PR branch | PASS | No direct commit to `main`. |
+| Documentation/governance scope | PASS | Only Project Instructions and reports changed. |

dev/reports/PR_26179_OWNER_011-pr-branching-model-docs_manual-validation-notes.md

@@ -0,0 +1,8 @@
+# PR_26179_OWNER_011-pr-branching-model-docs Manual Validation Notes
+
+## Notes
+
+- Reviewed active Project Instructions for existing stacked/sequential branch wording.
+- Added the canonical Independent PR vs Stacked PR model in `pr_workflow.md`.
+- Updated adjacent branch and command governance documents to point enforcement at the requested PR model.
+- Confirmed the old dependent-PR rule now allows the explicitly documented Stacked PR exception.

dev/reports/PR_26179_OWNER_011-pr-branching-model-docs_report.md

@@ -0,0 +1,31 @@
+# PR_26179_OWNER_011-pr-branching-model-docs Report
+
+## Purpose
+
+Define Independent PRs and Stacked PRs in active Project Instructions.
+
+## Scope
+
+Documentation/governance only. No implementation code, runtime files, API files, database files, or product pages changed.
+
+## Governance Outcome
+
+- `pr_workflow.md` now owns the canonical Independent PR vs Stacked PR model.
+- Independent PRs must start from synchronized `main`.
+- Stacked PRs may start from the documented previous PR branch only when there is a direct dependency.
+- Stacked PRs must document stack order, previous dependency, next dependency when known, starting branch, and merge order.
+- Stacked PRs must be reviewed and merged in dependency order.
+- Codex must HARD STOP when the requested PR model does not match the current/start branch.
+
+## Updated Documents
+
+- `dev/build/ProjectInstructions/addendums/pr_workflow.md`
+- `dev/build/ProjectInstructions/addendums/project_instructions_single_source_eod_lock.md`
+- `dev/build/ProjectInstructions/addendums/branch_lock_governance.md`
+- `dev/build/ProjectInstructions/addendums/branch_context_governance.md`
+- `dev/build/ProjectInstructions/standards/CODEX_WORKFLOW_COMMANDS.md`
+- `dev/build/ProjectInstructions/TEAM_START_COMMANDS.md`
+
+## ZIP
+
+- `dev/workspace/zips/PR_26179_OWNER_011-pr-branching-model-docs_delta.zip`

dev/reports/PR_26179_OWNER_011-pr-branching-model-docs_requirement-checklist.md

@@ -0,0 +1,11 @@
+# PR_26179_OWNER_011-pr-branching-model-docs Requirement Checklist
+
+| Requirement | Result | Notes |
+| --- | --- | --- |
+| Define Independent PRs vs Stacked PRs | PASS | Added canonical model in `pr_workflow.md`. |
+| Independent PRs must start from `main` | PASS | Documented in Independent PR rules. |
+| Stacked PRs may start from previous PR branch with direct dependency | PASS | Documented in Stacked PR rules and branch gates. |
+| Stacked PRs must document dependency order | PASS | Required before BUILD begins and in reports. |
+| Stacked PRs must be reviewed and merged in order | PASS | Required in Stacked PR rules. |
+| Codex hard-stops on starting branch/model mismatch | PASS | Added to PR workflow, branch context, branch lock, and command docs. |
+| Do not change implementation code | PASS | Documentation/governance only. |

dev/reports/PR_26179_OWNER_011-pr-branching-model-docs_validation-report.md

@@ -0,0 +1,11 @@
+# PR_26179_OWNER_011-pr-branching-model-docs Validation Report
+
+## Validation
+
+- `git diff --check`: PASS
+- `npm run validate:canonical-structure`: PASS
+- Project Instructions grep for Independent/Stacked PR rules: PASS
+
+## Runtime Impact
+
+No runtime, API, database, or product page files changed. Playwright was not impacted.

dev/reports/codex_changed_files.txt

@@ -1,16 +1,22 @@
 # git status --short
-A  dev/reports/PR_26179_ALFA_010-tool-display-single-line-summary_eod-branch-validation.md
-A  dev/reports/PR_26179_ALFA_010-tool-display-single-line-summary_eod-closeout-report.md
-A  dev/reports/PR_26179_ALFA_010-tool-display-single-line-summary_eod-manual-validation-notes.md
-A  dev/reports/PR_26179_ALFA_010-tool-display-single-line-summary_eod-requirement-checklist.md
-A  dev/reports/PR_26179_ALFA_010-tool-display-single-line-summary_eod-validation-report.md
+M  dev/build/ProjectInstructions/TEAM_START_COMMANDS.md
+M  dev/build/ProjectInstructions/addendums/branch_context_governance.md
+M  dev/build/ProjectInstructions/addendums/branch_lock_governance.md
+M  dev/build/ProjectInstructions/addendums/pr_workflow.md
+M  dev/build/ProjectInstructions/addendums/project_instructions_single_source_eod_lock.md
+M  dev/build/ProjectInstructions/standards/CODEX_WORKFLOW_COMMANDS.md
+A  dev/reports/PR_26179_OWNER_011-pr-branching-model-docs_branch-validation.md
+A  dev/reports/PR_26179_OWNER_011-pr-branching-model-docs_manual-validation-notes.md
+A  dev/reports/PR_26179_OWNER_011-pr-branching-model-docs_report.md
+A  dev/reports/PR_26179_OWNER_011-pr-branching-model-docs_requirement-checklist.md
+A  dev/reports/PR_26179_OWNER_011-pr-branching-model-docs_validation-report.md
  M dev/reports/codex_changed_files.txt
  M dev/reports/codex_review.diff
 
 # git ls-files --others --exclude-standard
 (no output)
 
 # git diff --stat
-dev/reports/codex_changed_files.txt |   55 +-
- dev/reports/codex_review.diff       | 2819 +----------------------------------
- 2 files changed, 88 insertions(+), 2786 deletions(-)
+dev/reports/codex_changed_files.txt |  22 ++-
+ dev/reports/codex_review.diff       | 377 ++++++++++++++++++++++++++++--------
+ 2 files changed, 310 insertions(+), 89 deletions(-)