friction: make check_pr_ci_status.py directly executable or document Python invocation

[ll7]

Observed during exact-head validation of PR #7102 on 2026-08-14:

• The repository guidance and maintainer workflow refer to scripts/dev/check_pr_ci_status.py <pr> as a reusable entry point.
• Invoking it directly from a fresh linked worktree fails with Permission denied because the file is not executable.
• The equivalent python scripts/dev/check_pr_ci_status.py 7102 invocation succeeds and reports the effective CI state.

Suggested bounded fix: either restore the executable bit and add a lightweight contract check, or update the documented invocation and shared wrappers to use the repository Python entry point consistently. The preferred outcome is one discoverable command that works exactly as documented in fresh worktrees and CI.

This friction does not change PR #7102’s research or merge disposition; it only adds a repeated manual workaround to CI readback.

[ll7]

#7112 implementation handoff

PR #7115 is open at exact head 0c4ac55818f1e5c922cfd4a52fe3e588c4f02348, based on current
origin/main e5acd8bff86a6c6266c6c8d4eb4f97564f9c80c7.

The fix restores executable mode 100755 for the existing
scripts/dev/check_pr_ci_status.py shebang entrypoint and expands the canonical test to cover
direct and Python help invocations with PYTHONPATH removed. No CLI content or runtime behavior
changed.

Proof is green locally: 59 focused tests, both help commands, Ruff/format checks, and
git diff --check; delegated implementation and self-review found no blocker. This is support
tooling only: no research result, benchmark evidence, compute, publication, or merge claim is
made. The PR is not merged; hosted CI and ordinary review remain pending.

[ll7]

#7112 implementation handoff

PR #7115 is open at exact head 0c4ac55818f1e5c922cfd4a52fe3e588c4f02348, based on current
origin/main e5acd8bff86a6c6266c6c8d4eb4f97564f9c80c7.

The fix restores executable mode 100755 for the existing
scripts/dev/check_pr_ci_status.py shebang entrypoint and expands the canonical test to cover
direct and Python help invocations with PYTHONPATH removed. No CLI content or runtime behavior
changed.

Proof is green locally: 59 focused tests, both help commands, Ruff/format checks, and
git diff --check; interim readiness also passed on the exact head with core lane and ratchets
green and no optional-extra lane required. Delegated implementation and self-review found no
blocker. This is support tooling only: no research result, benchmark evidence, compute,
publication, or merge claim is made. The PR is not merged; hosted CI and ordinary review remain
pending.

[ll7]

Resolved by merged PR #7115 at 65ebc834e68e5a19a5a8711c521913dbfa023262.

The existing scripts/dev/check_pr_ci_status.py entrypoint is again executable (100755), and
the contract test now covers both direct and Python help invocation with PYTHONPATH removed.
The exact-head review passed 59 focused tests, full interim readiness, and hosted CI. This was a
support/tooling repair only; it makes no research, benchmark, evidence, compute, or publication
claim.

[ll7]

Merge readback

PR #7115 was merged by maintainer ll7 at 2026-08-14T08:14:13Z as
65ebc834e68e5a19a5a8711c521913dbfa023262; the PR head was
0c4ac55818f1e5c922cfd4a52fe3e588c4f02348. origin/main now contains the executable mode
(100755) and the two-entrypoint test, and issue #7112 is closed with reason completed.

The parent agent did not perform the merge. The support-only claim boundary remains unchanged:
no research result, benchmark evidence, compute, publication, or paper-facing claim was made.