fix(core): bundle every RPC domain into frozen build + regression coverage

[clstaudt]

Summary

The distributed macOS app failed when committing from AI Document Import with:

Error invoking remote method 'rpc': Error: No module named 'tuttle.app.imports'

Root cause: the frozen PyInstaller core resolves intent modules dynamically via importlib (tuttle.app.{domain}.intent), so PyInstaller's static analyzer can't trace them. Each domain therefore had to be hand-listed in tuttle-rpc.spec's hiddenimports. The imports domain (and, latently, invoice_notes) was never added, so it was silently dropped from the release binary — even though it worked fine in dev. A missing __init__.py (fixed in #351) was necessary but not sufficient.

Changes

• Real fix: replace the fragile hand-maintained hiddenimports list with collect_submodules("tuttle.app"), so every present and future domain is always bundled. Verified it discovers all 19 intent modules, including imports and invoice_notes.
• Unit guards (tuttle_tests/test_rpc_dispatch.py):
  • every tuttle/app/<domain> is a real importable package with exactly one *Intent class (catches missing __init__.py)
  • collect_submodules covers every on-disk domain (catches spec drift); skips if PyInstaller absent
• End-to-end smoke test (scripts/smoke_core.py): spawns the actual frozen binary and probes every domain, asserting none returns "No module named". Wired into CI before the expensive packaging step (fail-fast), into pack_electron.py, and as a just smoke-core recipe.
• Terminology: renamed the Python core from "sidecar" to "core" across build scripts, spec, workflow, bridge, and docs.

Why the previous coverage missed this

The existing test_rpc_dispatch.py runs against the source tree, so it structurally cannot catch a packaging regression in the frozen binary. The new guards target the exact mechanism the release build depends on.

Test plan

• uv run pytest -q — 336 passed
• Negative check: removing tuttle/app/imports/__init__.py makes both unit guards fail with a precise diagnostic
• Built the frozen binary and ran scripts/smoke_core.py — all 19 domains bundled & importable
• CI green on the new "Smoke-test core" step across all platforms

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