Closes hull #7 ("ingen brief-historikk"). Each morning brief now records the
trend ids it showed into its own YAML frontmatter (surfaced: <id-csv> =
surfacedIds(ranking)) and renders a day-over-day diff against the most recent
prior brief — a "## Nytt siden sist (<prior-date>)" section that leads the
ranked list, plus a " N nye siden sist." marker on the one-line summary the
SessionStart hook surfaces (no hook change).
- brief.ts: BRIEF_SCHEMA_VERSION 1->2 (artifact frontmatter gained surfaced:;
the store's SCHEMA_VERSION stays 4 — no store field). Three PURE helpers
(diffSurfaced / parseSurfacedFrontmatter / selectPriorBriefFile) + the
surfaced: emit + the section + the summary marker. No fs/clock in brief.ts.
- cli.ts: the brief handler discovers the prior dated file (existsSync-guarded
readdirSync -> selectPriorBriefFile, strict < today so a same-day re-run is
byte-identical), parses its surfaced: line, computes the diff, threads it into
renderBrief AND the shared briefSummary(ranking, diff) (one-source: file
frontmatter == --json summary, cli.test one-source invariant). --json gains a
diff:{priorDate,added,carried,dropped} counts object; the console line appends
the delta. Any fs error degrades to the empty-prior (first-brief) path.
TDD two-phase: stubs -> 17 value-RED (no module-not-found) -> GREEN. Trends suite
216 -> 245 (brief +27, cli +2), 0 fail. New unconditional gate Section 16n (6
checks); ASSERT_BASELINE_FLOOR 117 -> 123; TRENDS_TESTS_FLOOR -> 245. Full gate
FAIL=0; hook suite 139/139 + R3c schedule/run-daily green untouched. Behavioural:
real two-day rename-real-write diff + same-day byte-identity confirmed. Counts
29/19/27 unchanged; no version bump (additive, v0.5.2 dev).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011vmzxpsFpc8q19LaogAWLD
Kjell Tore Guttormsen
5b51b4baeb