Adopt Cursor 0.15.24 workflows and GitHub frontier discovery

[arjitj2]

Catch up with Cursor Pstack 0.15.24 while preserving this distribution’s Codex/Claude commands, configured providers, model efforts, spending policy, and parent ownership of Git operations.

Adds manual /sharpen, format-only Autopilot summaries, and GitHub frontier discovery. Discovery now validates a complete, consistent linear PR chain before writing it and refuses forks, ambiguous histories, incomplete observations, or accidental clearing of active work. Existing command syntax remains supported through checkout-context repository discovery. Version 1.16.0 was explicitly approved as a compatible minor release.

Validation at 3ca5bd464907cde55e4b7c180082867368c2b427:

• All 950 serial tests and exact-head Linux CI pass, including strict type checks and documentation/maintenance checks.
• The installed Codex candidate passes real single-PR discovery, fork rejection, explicit/environment/checkout-context resolution, clearing safeguards, and 26 packaged topology/planner regressions.
• Sol’s independent exact-head source review passes with no findings.
• Claude’s product checks and post-reset evidence reconciliation pass. The initial 26-test run hit a local five-second timeout; the identical rerun and JUnit run each passed all 26. This remains a documented test flakiness risk. The original reporting turn exhausted quota after product checks.
• The Opus review exhausted quota and the saved fallback policy selected a fresh GPT-6.1 Sol reviewer at high effort. Both independent Sol reviews pass with no findings; provider diversity is reduced.
• Complex topology uses simulated GitHub responses with disposable Git fixtures. No live remote multi-PR stack or hard worker-confinement claim is made. Unchanged workflow proofs are retained by exact contract hashes. The SWE-2 review seat stopped on a permission denial without a usable report; no three-provider agreement is claimed.

Cursor source checkpoint is 1e5c90a4b6f249917bd21fe361b3a2a7deb741b8. Every source entry is assessed in the adoption ledger. Package tree is e8bcb448a566b544299d6d32f567ffe8114431dc.

Closes #126. Related ongoing maintenance tracker: #1.

[arjitj2]

Independent exact-head verdict at 3ca5bd464907cde55e4b7c180082867368c2b427: PASS+NOTES. Two independent GPT-6.1 Sol reviewers found no findings. The Opus seat exhausted quota and used its approved Sol backup; the SWE-2 seat stopped on permission denial. This is reduced provider diversity, not three-provider agreement.

All 950 serial tests and exact-head Linux CI pass. Both real-host command checks are reconciled; all 233 packaged files match. Claude’s initial five-second test timeout passed on identical rerun and JUnit run, and remains a local test flakiness risk. Live remote coverage is one same-repository PR and a closed fork rejection; complex topology is simulated with disposable Git. Unchanged workflow proof is retained by exact hashes. No hard worker-confinement claim.

The owner explicitly approved compatible minor release 1.16.0. Parent will use a server-enforced expected-head merge guard and verify the published package before local Codex rollout.