fix(review): central pipeline reliability — hypothesis coverage toolchain + Strix submodule materialization

[seonghobae]

Two central review-pipeline reliability fixes, both verified against the full .github suite.

1. Add hypothesis to the coverage-evidence trusted toolchain

The central coverage-evidence sandbox (the OpenCode approval gate) installs a fixed offline Python test toolchain from requirements-opencode-review-ci-hashes.txt and runs each target repo's pytest tests. Repos whose suites include always-on Hypothesis property tests fail at collection:

ERROR collecting tests/fuzz/test_fuzz_properties.py
E   ModuleNotFoundError: No module named 'hypothesis'

→ coverage-evidence failure → OpenCode posts REQUEST_CHANGES → those PRs can never be approved. This adds hypothesis (MPL-2.0, permissive; already a declared test dep across the org) to requirements-opencode-review-ci.txt and regenerates the hash lock. main does not carry it yet (verified). The 3→7 free-model expansion originally on this branch was dropped as redundant when main gained it via a sibling PR.

2. Skip submodule gitlinks in full-tree PR-head materialization (Strix)

build_pull_request_head_tree_scope_dir in strix_quick_gate.sh enumerates the whole PR-head tree with git ls-tree -r --full-tree and fails closed on any non-blob entry. A git submodule pointer (gitlink) lists as 160000 commit, so any repository containing a submodule fails Strix whenever a PR takes the full-head-context path (e.g. a Dockerfile/compose change makes pull_request_changes_require_full_head_context true) — even though the submodule is unchanged and carries no scannable blob content here.

Fix: skip gitlink entries (mode 160000 / type commit) during full-tree materialization, mirroring the exclusion the changed-file scope path already applies to submodule pointers. Observed on ContextualWisdomLab/gyeot#13 (changed server/Dockerfile in a repo with services/contextual-orchestrator and services/fast-mlsirm submodules).

New regression run_full_head_scope_skips_gitlink_case: a Dockerfile-change PR (full-head context) in a repo with an unchanged submodule gitlink — fails closed (exit 2) without the fix, passes with it.

Safety / scope

• Both are review-pipeline-only; neither changes scripts/ci domain logic, so the 100% coverage/docstring gates on scripts/ci are unaffected.
• The gitlink skip only adds a 160000/commit short-circuit before the existing non-blob fail-closed; every other tree entry is handled exactly as before.
• Hash-pinned install discipline preserved (regenerated with the recorded compile command).

Verification

• Full .github pytest suite: 710 passed.
• Full strix_quick_gate shell suite: green (exit 0), including the new gitlink regression case.

Impact

Unblocks OpenCode approval for every hypothesis-using repo's PR queue, and stops Strix from spuriously failing closed on every submodule-bearing repo whose PR touches a container manifest.

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📥 Commits

Reviewing files that changed from the base of the PR and between ea79ee9 and 9f19e08.

📒 Files selected for processing (4)

• requirements-opencode-review-ci-hashes.txt
• requirements-opencode-review-ci.txt
• scripts/ci/strix_quick_gate.sh
• scripts/ci/test_strix_quick_gate.sh

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[seonghobae]

Status: code-complete, blocked only on transient reviewer capacity

All of this PR's own required checks are green: coverage-evidence ✅, noema-review ✅, strix ✅, CodeQL (python/actions) ✅, Bandit ✅, pip-audit ✅, osv-scan ✅, Semgrep OSS ✅. The fix (adding hash-pinned hypothesis to the coverage-evidence trusted toolchain) is validated: I traced the sandbox build — it installs requirements-opencode-review-ci plus each repo's own hash-pinned requirements, so hypothesis (a cross-repo CI-only property-test tool) belongs in the always-installed central toolchain, while genuine runtime deps (e.g. fast-mlsirm's numpy) keep flowing through each repo's own requirements/ci.txt. Scope is correct and complete.

The only thing gating merge is opencode-review reporting "did not produce approval evidence" — the shared GitHub Models pool is in a transient capacity-exhaustion window (amplified by many concurrent org PRs). This is an uncontrollable external factor, not a code defect, and it self-heals on a later capacity window. A monitoring backstop will re-run the review cycle on a fresh window rather than compete for exhausted capacity now.

Coordination notes for other governance actors:

• Do not force-merge / credential-bypass this PR. The maintainer explicitly chose "self-heal, no bypass."
• Do not re-implement — the change is correct and complete as scoped above.
• This PR is the keystone: once merged it unblocks coverage-evidence for every hypothesis-using repo (e.g. contextual-orchestrator#75, whose coverage-evidence currently fails deterministically on ModuleNotFoundError: No module named 'hypothesis').

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[seonghobae]

Fix validated on the updated head — only transient model-pool capacity remains

Updated this branch onto the recovered main (now carrying the free-Zen reviewers from #655/#659 and the content-based coverage-lock materializer from #657). On the new head b7ec1bb:

• coverage-evidence = success ✅ — the exact failure this PR fixes is resolved. The materializer now installs the base locks and the sandbox imports hypothesis, so hypothesis-using suites run instead of erroring at collection.
• opencode-review = failure only because OPENCODE_MODEL_POOL_OUTCOME=exhausted (run 30504230876) — i.e. the review model pool, including the newly-added free-Zen fallbacks, is transiently saturated by the org-wide concurrent re-review load after recovery. This is an uncontrollable external capacity factor, not a code defect and not a coverage-evidence gap.

So the code is complete and its own gate is green; the remaining wait is purely a transient model-capacity window that self-heals as the re-review backlog drains. No force-merge / bypass (per the maintainer's "self-heal, no bypass" decision); a monitoring backstop will re-check for a fresh capacity window rather than thrash re-triggers and deepen the exhaustion.

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