docs(todo): TRIM bookkeeping — mark TRIM-007 Done

[keithdv]

Summary

Bookkeeping commit marking TRIM-007 Done after PR #71 merged. This PR itself is one docs file — the code shipped through PRs #68–#71 — but it's a good vantage point for the cumulative TRIM impact since the todo began:

Full diff: 2275e79...TRIM — 59 files, +3,141 / −218

Category	Files	Lines
Production (Generator + RemoteFactory)	14	+432 / −103
Tests + trimming harness	15	+1,554 / −48
Docs, Design source of truth, skill refs	9	+78 / −67
Todo container (plans, reviews, discovery log)	19	+1,038
CI + solution	2	+39

What that bought (PRs #68–#71)

• test: make the publish-trimmed harness an enforceable CI gate (TRIM-004) #68 TRIM-004 — the trimming harness became an enforceable CI gate (was: outside the sln, exit-0 on failure, hadn't compiled since v1.5.0)
• feat(generator): preserve positional-record DTOs in factory signatures (TRIM-001) #69 TRIM-001 — positional records in factory signatures preserved (PreserveType<T> bucket) — the StartVisitResultV2 failure class
• feat(generator): discover DTOs carried as [Factory] entity properties (TRIM-002) #70 TRIM-002 — DTOs carried as [Factory] entity properties discovered via per-entity self-walk — the TreatmentBanner/DashboardContactResult failure class — plus the Systems.* namespace hardening
• feat(generator): per-assembly event-preservation registrar — subscribe-only events survive trimming (TRIM-003+007) #71 TRIM-003+007 — proved inherited DAM does not preserve event-record descendants under ILLink, then fixed it with the generator-emitted per-assembly event-preservation registrar (subscribe-only events + their nested graphs now automatic)

Remaining queue: TRIM-005 (server-only over-retention), TRIM-006 (incremental-cache regression test), then the release step (AC4/AC5 — the version zTreatment PCB-003 consumes).

🤖 Generated with Claude Code

[keithdv]

Closing unmerged — the bookkeeping commit stays on the TRIM arc branch and will ride along in TRIM-005's PR rather than landing as a docs-only PR of its own. No content is lost; origin/TRIM keeps the commit.