fix(ci): gate checks by relevant changes

[hadrien]

Problem

• Required matrix checks run for release-only metadata changes.
• Dispatched release checks do not attach to generated pull requests.

Solution

• Run expensive checks only for code, dependency, or CI changes.
• Expose one stable CI gate for branch protection.
• Mirror successful dispatched jobs onto the exact release commit.

fs-3z4

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.74%. Comparing base (2b78467) to head (a79e91d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #134   +/-   ##
=======================================
  Coverage   97.74%   97.74%           
=======================================
  Files           1        1           
  Lines         133      133           
  Branches        7        7           
=======================================
  Hits          130      130           
  Misses          3        3           

Flag	Coverage Δ
fastapi-post121	97.74% <ø> (ø)
fastapi-pre121	97.74% <ø> (ø)
sqlmodel	97.74% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.