[Pepps233]

Summary

Renumber visible context block selectors in context order after compaction.

Reasoning

Sequential visible selectors make the current context order explicit after blocks are replaced.
Stable internal identities and compacted archive IDs preserve recall and persisted provenance.

Changes

• Project sequential visible b... IDs while retaining stable internal block identities.
• Keep compacted ctx-... archive IDs unchanged.
• Tell the agent to use current block headers because IDs in past tool calls are stale.
• Apply the same receipt during successful compaction, idempotent retry, and crash replay.
• Verify nested archive recall after compaction, session reload, and branch forks.
• Preserve historical tool arguments and the unchanged prefix before the compacted span.

Testing

• npm run check passed before this commit and again on the rebased stack.
• All 35 goal test files passed on the rebased stack: 207 tests, using node ../../node_modules/vitest/dist/cli.js --run test/suite/goal-*.test.ts test/suite/agent-session-goal*.test.ts test/suite/pocket-context-projection.test.ts from packages/coding-agent.
• Targeted goal suites cover consecutive compactions, sequential headers, native-message preservation, crash replay, and actual recall tool execution.
• Reproduced out-of-order visible IDs before changing the implementation.