Show demo PR annotations in README#8
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…ion-drift blind spots (#49) * fix: run CLI bin through symlinks and stop false Codex baseline drift Two trust-critical fixes flagged in external review. 1. npm installs the `scopetrail` bin as a symlink, so the entrypoint's `import.meta.url === process.argv[1]` main-module check was false when launched via `npx`/global install: main() never ran and the CLI exited 0 with no output -- a CI gate that silently passed every PR. Resolve both sides through realpathSync. Add a test that runs the built bin through a symlink (the existing CLI tests only ran `node dist/index.js` directly). 2. Codex sandbox/approval drift ranked a missing base value at -1, so a brand-new .codex/config.toml that merely set the narrowest posture (read-only sandbox, untrusted approval) was reported as a high-severity widening/weakening -- a false positive on the safest possible config. Anchor the missing baseline at Codex's safe default so only settings genuinely wider than that default surface; a brand-new danger-full-access sandbox or `never` approval still fires. Add unit tests for both Codex directions and a benign benchmark fixture (codex-baseline-narrowest); regenerate RESULTS.md (29 cases, precision/recall unchanged at 100%/0% FP) and sync the README corpus counts. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * feat: close remaining permission-drift blind spots and tighten docs Implements the rest of the external review (the trust-critical bin/Codex pair landed in the previous commit). Detector blind spots: - #4 Merge all recognized MCP server maps instead of first-map-wins, so an empty `mcpServers: {}` can no longer shadow a populated `servers: {}` in Cursor/VS Code configs. - #3 Diff sensitive MCP fields (env, headers, cwd) on existing servers, which serverCommand()-based comparison ignored. A server keeping the same command but gaining a secret env var or auth header now surfaces; secret-bearing key names escalate to high. Applies to .mcp.json and Codex [mcp_servers.NAME]. Removals stay silent (narrowing, not widening). New kinds: scope_trail.mcp_server_sensitive_field_changed and scope_trail.codex_mcp_sensitive_field_changed. - #5 Model Claude hook entries by (matcher, type, command) rather than command alone, so rebinding a guard from one tool to another (same command) is caught. NOTE: this reverses the prior "matcher change is noise" decision and its test — a PreToolUse guard moved from Bash to Read stops guarding Bash, which is a real enforcement-surface change. - #7 Expand the critical removed-deny pattern set beyond .env/secret/ credential/.pem to SSH keys, *.key, cloud credentials, registry tokens, and kube configs. Docs & supply-chain: - #2/#8 Qualify the README "local-only" claim: the scanner uploads nothing, but the Action's setup step runs `npm ci` from the registry. - #9 Pin agent-gov-core to exact 1.3.0 (lockfile kept in sync) so npm consumers do not silently resolve a newer parser/schema. - #10 Note that the benchmark figures bound regressions, not real-world field accuracy. Each change ships unit tests and a labeled benchmark fixture. Corpus grows to 35 cases (27 rogue, 8 benign) across 21 detector kinds; precision/recall hold at 100%/0% false-positive rate, RESULTS.md regenerated and README counts synced. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * fix: clean up base snapshot when head materialization fails runDiff materialized the base snapshot, then the head snapshot, and only assigned `cleanup` after both succeeded. If head materialization threw — an unresolvable head ref (a shallow checkout missing it), or a max-buffer error on an oversized config — the base snapshot's temp dir was already on disk and leaked, since cleanup was never wired up. Clean the base snapshot explicitly before the error propagates. Found during a fresh correctness pass over the codebase (not part of the external review). The existing unresolvable-ref test fails on the *base* ref, before any dir exists, so it never exercised this path. Adds a regression test that asserts no scopetrail-snapshot temp dir survives a head-side failure. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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