Fix: journal today only sees the daily file — must aggregate all of a day's notes (project notes, transcripts)

[claude]

🤖 Agent-Generated PR

Closes #55
Agent Used: Claude Code
Complexity: medium

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Summary

journal today reported empty even when notes were captured — as long as those notes landed somewhere other than daily/YYYY/MM/YYYY-MM-DD.md. This fix rewrites the Notes section of gatherToday() to query the store for all note chunks from today instead of reading a single hard-coded path.

Implementation Notes

• Followed the existing pattern for decisions/meetings: open the store, query with a store.Filter, render results. The decisions/todos/meetings sections were already store-driven; only Notes was reading a raw file.
• Added gatherNoteMD() helper (opens store, queries Filter{Source: store.SourceNote, Since: midnight}) and buildNotesMD() (assembles aggregated Markdown with daily chunks first, then project note chunks labelled with their source path).
• midnight is now computed once at the top of gatherToday() and shared with the meetings section (previously the meetings section computed it separately).
• journal://today resource (option a): left as the literal daily file. The resource maps to a file; the aggregated view is the today tool. The description is unchanged — it already says "Corresponds to daily/YYYY/MM/YYYY-MM-DD.md". The issue discussion explicitly recommends (a).
• The MCP today tool (mcpToday) routes through gatherToday() so it inherits the fix at zero extra cost.

Changes

• cmd/show.go: Replace single-file read in gatherToday() with store query; add gatherNoteMD() and buildNotesMD() helpers; update todayReport.Notes field comment.
• cmd/show_test.go: Two new tests — TestGatherTodayAggregatesAllSources (daily + project note + transcript: both notes in Notes, transcript only in Meetings, project source attributed) and TestGatherTodayProjectOnlyNotEmpty (project-note-only day is not empty).
• docs/USAGE.md: Clarified that today aggregates all sources; noted the journal://today resource/tool distinction.
• book/src/daily-use.md: Updated the "morning" section description.
• CHANGELOG.md: Added Fixed entry under [Unreleased].

Testing

Automated:

• Unit tests added/updated
• All existing tests pass (make test green, all 11 packages pass)

Manual testing performed:

• make fmt vet clean
• make build succeeds
• make test green (serial -p 1)

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Review Checklist

Correctness

• Code actually solves the issue
• Acceptance criteria are met (store query replaces file read; project-only day non-empty; MCP tool fixed for free; source attribution in output; journal://today resource unchanged per option a)
• Edge cases handled (empty store → "No notes yet today" placeholder; transcripts excluded by Source filter)

Code Quality

• Follows existing codebase patterns (store query pattern matches decisions/meetings)
• Follows project coding standards
• No unnecessary complexity

Tests

• Tests actually test behavior
• Edge cases covered (project-only, multi-source, transcript exclusion)

[claude]

Retro: no durable lesson (merged clean / one-off).