[Jammy2211]

Summary

projects.yaml had been tripled by 25e0168 (2026-09-17, the euclid_dr1 / euclid_sersics birth recovery): lines 292–610 repeated the 11 rows analytic_gaussian…autolens_inference twice more, byte-identical to the first copy (which alone also holds the retired euclid_sersics row). yaml.safe_load silently kept the last copy, so the parsed body map was unchanged but every edit had to be made three times and any divergence between copies would have been invisible. This PR drops the two copies (610 → 290 lines, 17 keys unchanged) and makes cortex.py check reject a repeated project key so it cannot recur.

Part of the 2026-09-30 EP check-in clean-up (PyAutoCortex#50). The ledger side of that task (seven stale runs closed, ## Now rewrites, check-in notes) landed on main directly as ledger commits; this PR is the code half.

API Changes

None for library users. cortex.py check gains one new problem string: projects.yaml: duplicate project key '<key>' (lines a, b, …), raised from a raw column-0 key scan that runs before yaml.safe_load in parse_projects. Validation continues after a duplicate (like the per-row problems); only invalid YAML / non-mapping documents still return early. REFERENCE.md "projects.yaml" states the one-row-per-key rule.

Test Plan

• python -m pytest tests -q in the worktree: 65 passed
• python3 scripts/cortex.py check: OK
• New test_projects_yaml_rejects_duplicate_project_keys fails with the guard removed, passes with it
• Guard run on the pre-fix 610-line file reports all 11 tripled keys, e.g. duplicate project key 'analytic_gaussian' (lines 118, 292, 452)
• yaml.safe_load key set identical before and after (17 keys)
• scripts/ledger_merge.py classify --base origin/main: all 4 paths classified code (human review), as intended
• pyauto-brain cortex dashboard --check: pages already current, no regeneration needed

Full API Changes (for automation & release notes)

Added

• scripts/cortex.py::_duplicate_key_problems(text) — raw column-0 key scan; returns one problem per repeated key with its line numbers
• scripts/cortex.py::PROJECT_KEY_LINE_RE — ^([a-z][a-z0-9_]*):\s*(#.*)?$

Changed

• scripts/cortex.py::parse_projects seeds its problems list from the duplicate scan before yaml.safe_load
• projects.yaml — lines 292–610 removed (two byte-identical copies)
• REFERENCE.md — one-row-per-key rule documented under "projects.yaml"

Follow-up (not in this PR)

• projects.yaml header comment (lines 12–13) still says the file is parsed with the stdlib and points at a REFERENCE.md "restricted YAML subset" section that no longer exists

Generated by the PyAutoLabs agent workflow.

Heart RED override (development only)

• Authorised by the live human in the Claude Code session at 2026-09-30 ~10:55 BST: "Override for all three (Recommended)" — RED override for PyAutoCortex#50 (push + open the pending-release PR) and for opening two PyAutoFit tasks; no merge, no release.
• Exact RED reasons at the 10:51 BST tick: "PyAutoArray: 2 commit(s) behind origin"; "PyAutoLens: 2 commit(s) behind origin"; "release validation FAILED (stage integrate)".
• Branch gates passed: pytest tests 65 passed; cortex.py check OK; ledger_merge classify → code (human review).
• This PR does not claim to fix Heart. Heart remains RED for release purposes; merge needs its own human command and green required checks.

🤖 Generated with Claude Code