chore: post-review cleanup — docs drift, CONTEXT.md section order, review nits

[LeXwDeX]

Findings from the two-axis review of 44c5843..HEAD (both PASS, info-level)

1. AGENTS.md Git Workflow prose/table still says the dev PR gate is Typecheck-only — now Typecheck + Unit Tests (linux) (chore(ci): raise the dev PR gate to Typecheck + Unit Tests (linux) (middle-tier gating) #370).
2. CONTEXT.md: the decide(dag): 'one live DAG per user goal' is documented as an Invariant but is an unenforced convention #348 Conventions header was inserted mid-list, accidentally demoting 5 original Invariants (incl. the engine-enforced gated-checkpoint obligation) into Conventions.
3. memory-search: a no-op if-split (both arms identical) — restore the || form.
4. blocks.ts: BLK-02 collision check inlined as an IIFE — extract a named helper per the Style Guide.
5. Documented delta: fix(goal): GoalLoop not wired into server request-context node graph — standing goals stall on headless serve/web/desktop #340's third acceptance line (serve-mode goal-past-turn-1 e2e) is covered functionally by e2e-loop.test.ts behavior tests + the wiring probe for the exact failure class; no third harness.

Acceptance

• the five fixes above land

[LeXwDeX]

Delivered via PR #375 (merged to dev); all five review findings addressed (AGENTS.md gate drift, CONTEXT.md section order, memory-search ||, blocks helper extraction, #340 delta documented). specgit finish exit 0.