fp-drift (Phase 5 — Drift Check & Final Summary)

Verify no unintended registry changes leaked into the branch, then close the
pipeline with a human-readable summary that includes a CI churn report.
Runs in the main turn — no sub-agent.

Setup

Read pipeline state:

STATE=".agents/skills/feature-pipeline/scripts/state.sh"
feature=$($STATE get feature)
branch=$($STATE get branch)
pr=$($STATE get prNumber)
prUrl=$($STATE get prUrl)
issues=$($STATE get issueNumbers)
ciStatus=$($STATE get ciStatus)

If ciStatus is not "green", stop here — the drift check is only meaningful
once CI has passed, because a failing run may have left the branch in a
partially applied state:

⚠ CI is not confirmed green. Run /fp-iterate first, then re-run /fp-drift.

Drift check

Fetch the latest main so the diff is against the true merge base, not a stale
local ref:

git fetch origin main
gaia dev diff 2>/dev/null || gaia dev validate

gaia dev diff compares registry nodes on this branch against origin/main.
Any field change, added node, or removed node will appear here. The question
to answer: are ALL changes attributable to the stated purpose of this PR?

If unexpected drift is detected (skills or fields changed that have no
connection to {{feature}}):

Print a warning table so the user can make an informed call — do not silently
discard or auto-revert the drift:

⚠ Skill drift detected — please confirm these changes are intentional:

| Skill ID | Field | Value on main | Value on branch |
|----------|-------|---------------|-----------------|
| …        | …     | …             | …               |

End your turn and wait. The user may say "intentional", may ask you to revert,
or may open a follow-up PR. Never decide for them.

If no unexpected drift (or all drift is confirmed intentional):

Collect the commit list for the summary:

git log origin/main..HEAD --oneline

CI Churn Report

Before printing the final summary, run the /ci-churn script to measure how
many commits and CI-compute seconds were burned on avoidable push rounds.
See .claude/skills/ci-churn/SKILL.md for full documentation.

python3 scripts/ci_churn.py "$pr" 2>/dev/null

If $pr is unavailable from state, pass the PR number directly.
If the script is unavailable (not yet in repo), skip gracefully with a note.

Capture the output and embed it verbatim in the final summary under a
CI Churn section. Do not interpret or editorialize the numbers —
just include the raw report so the human can read it directly.

Print the final summary and close the pipeline state:

✅ Feature Pipeline Complete
════════════════════════════════════════════════════════

Feature explored : {{feature}}
Issues filed     : <count>  (links: <#N> <#M> …)
PR               : <prUrl>
CI               : All checks green ✅
Skill drift      : None detected ✅

Commits
───────
<sha7> <message>
…

What was fixed
──────────────
• <issue title>
…

CI Churn
────────
<output of python3 scripts/ci_churn.py $pr>

$STATE set phase 7
$STATE set ciStatus "done"

── Pipeline complete ──────────────────────────────────────────────────────────