Add repeatable verification and establish fresh save checkpoint

Consolidate current readiness and existing rule decisions, preserve selective
subagents and automatic verified Git pushes, and record the efficiency pilot.
Add source-bound compact checks, private saved-game snapshots/online backups,
and bounded HTTP seat-restoration checks with 15 meaningful regressions.

At the user's explicit request, archive and clear 3,644 old local rooms and
related records while retaining schema/migrations; preserve future games from
a fresh empty baseline. Private backups and credentials are outside Git.

Validation: npm run check passes types, lint and all 4,177 offline tests.
Full report: 20260913-efficiency-check-3, 130.147 seconds; source fingerprint
344ce1d44475b0cd4ff10a915f28331cb4e2fcacbc7595636fbaa645c0568f64.
Two earlier broad attempts stopped at new type/lint errors before tests;
both were fixed. Independent review found cancellation falsely passing;
SIGINT/SIGTERM regressions and review confirm the fix. Documentation links,
example test selection, private backup integrity and empty baseline verified.
No app/build/dependency/HTTP implementation changed; no production build,
HTTP suite, browser acceptance or AI calibration claimed for this checkpoint.
The full game goal and existing release gates remain unfinished.

docs/DEVELOPMENT.md

@@ -4,6 +4,11 @@ Start with [README](../README.md) for installation and saved-game behavior and
 [AGENTS.md](../AGENTS.md) for project invariants. This page is a navigation and
 verification guide, not a second implementation-status log.
 
+Start with [current status](CURRENT_STATUS.md) and [rule decisions](RULE_DECISIONS.md).
+Use [repeatable verification](VERIFICATION_WORKFLOW.md) for compact source-bound
+logs, private saved-game backups/comparisons and HTTP seat restoration.
+The [three-milestone pilot](EFFICIENCY_PILOT.md) records measurement limits.
+
 ## Architecture map
 
 | Concern                            | Entry points                                                                                       |