fix: restore short git SHA in version banner

[nerdCopter]

AI Generated pull-request

Summary

• The vergen 8 -> vergen-gitcl 10 migration (build: cargo update and vergen 8 -> vergen-gitcl 10 #44) switched build.rs from EmitBuilder::git_sha(true) (short SHA) to Gitcl::all_git(), which emits the full 40-char VERGEN_GIT_SHA instead.
• Regression: bbl_parser --version now prints the full SHA (bbl_parser 1.0.1 76b67b5d7a48cb79125ab18be6864c77f44bbb9d (2026-07-02)) instead of the short one used since 1.0.0 (bbl_parser 1.0.0 03b87d3 (2025-12-30)).
• Fix: Gitcl::all().sha(true).build() keeps all other VERGEN_GIT_* instructions enabled while restoring short-SHA output (Gitcl::builder().all() is a private crate-internal method, so Gitcl::all() is the public equivalent).

Test plan

• cargo build --release and cargo test --release pass (19 unit/integration tests + 3 doc-tests)
• bbl_parser --version now prints a 7-char short SHA (e.g. 61448ef)

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: f6e08b19-c573-4689-9c24-0850171a657f

📥 Commits

Reviewing files that changed from the base of the PR and between 61448ef and 9afb8ac.

📒 Files selected for processing (1)

• build.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/short-git-sha

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