fix(rag): store full hybrid ID in page-level chunk metadata

[twaugh]

Page-level chunks (PAGE) were stored with block_id="PAGE" in ChromaDB metadata, causing all pages to map to the same short ID ("1") in LLM prompts. This meant the LLM couldn't distinguish between different page-level chunks when making integration decisions.

Changes:

• Store full hybrid ID (e.g., "Andrew McNamara::PAGE") instead of just "PAGE" in metadata block_id field
• Bump INDEX_SCHEMA_VERSION to 5 to trigger automatic reindex
• Each page-level chunk now gets unique short ID (1, 2, 3, ...)

Impact:

• Before: for all pages (collision)
• After: , , (unique)
• LLM can now reference specific page-level chunks correctly

The schema version bump ensures automatic index rebuild on next logsqueak extract/search command with no user intervention needed.

Assisted-by: Claude Code

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.61%. Comparing base (3681a2d) to head (f9765df).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #38   +/-   ##
=======================================
  Coverage   84.61%   84.61%           
=======================================
  Files          48       48           
  Lines        5088     5088           
=======================================
  Hits         4305     4305           
  Misses        783      783           

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