fix(stokowski): keep PR branches intact and accept "Accept" approvals

[ruby-automation]

Two small fixes to the stokowski setup, both found while finishing EXT-68.

1. before_run no longer rewrites pushed branches (workflow.glean.yaml)

The hook rebased every clean branch onto origin/main. PR #286's branch contained a merge from main (from "Update branch"). On that branch the rebase dropped the merge commit and replayed the 5 feature commits, which left the workspace ahead 5, behind 6 of the PR, and it did this on every dispatch.

Now:

• A branch with an upstream (main, or a pushed PR branch) is only fast-forwarded to that upstream with git pull --ff-only, and is never rewritten.
• Only an unpushed local branch still rebases onto origin/main.

I ran the hook with /bin/sh against a scratch repo:

Case	Result
main behind origin/main	fast-forwarded
Pushed PR branch containing a merge commit	unchanged, in sync with its upstream
PR branch that moved upstream	fast-forwarded
Unpushed local branch	rebased onto the latest main

All four exit 0.

2. Improvement accepts "Accept" (improvement.md, glean.md)

EXT-68's approval read "Accepted: G1, G2, and G3". It contains no Approve, so under the prompt's own rule nothing should have been created, yet improvement created all three. The result was right, but the agent broke its rule to get there.

• The rule now accepts a word starting with Approve or Accept.
• The report's first claim must quote the approval comment it used, word for word, so a reviewer can check the match.
• Glean's instruction to the reviewer mentions both words.

Verification

• workflow.glean.yaml parses, and the hook cases above pass.
• The pre-commit gate passed: 24 root tests, 596 app tests, Credo clean.

🤖 Generated with Claude Code