The Phase 6+ section had two duplicate '### Active' headers, which
made the chronology confusing. The user (paraphrased): preserve the
chronology of project progress, don't need full detail, follow the
previous restructure's lightweight pattern.
Changes:
- Add '### Recently Completed (2026-06-06 to 2026-06-10)' subsection
containing the 3 closed tracks (startup_speedup, test_batching_refactor,
test_infrastructure_hardening) with lightweight entries: per-phase
commit SHAs only, 1-line summary, link to spec/plan/state folder.
Trimmed the verbose per-sub-track commentary that was in the old
startup_speedup entry (the per-sub-track bullets for warmup, status
indicator, audit violations, post-shipping fixes are in the
archive's spec/plan, not the tracks.md).
- Remove the duplicate '### Active' header.
- Update section intro to reflect '3 recently completed, 4 in plan'
(was '2 already completed, 3 in plan').
- test_infrastructure_hardening entry now has phase commit SHAs
(5df22fa8, 67d0211e, 006bb114, b8fcd9d6, 33d5cac, 7b87bbf5,
84edb200, 719fe9a) instead of just the closing-report link.
Chronology is now visible at a glance; per-track full detail is
in the linked archive/ folder.
ed
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