fix(marketing-plan): address review findings from codex + local audit

Resolves 12 issues found during comprehensive review:

Spec compliance:
- Trim description from 1025 to 963 chars (was over 1024 limit)
- Drop non-standard top-level version field (VERSIONS.md tracks repo-wide)

Cross-marketplace clarity:
- Note that audit-marketing/positioning live in adjacent cf-skills repo
- Document optional external skills in ops-stack-mapping (typefully, etc.)

Idea cross-reference fixes:
- Correct Activation count (7 -> 8) and Acquisition count (88 -> 116)
- Rename "ideas" to "entries" for accurate row vs unique-idea distinction
- Add "How to read this doc" legend explaining 139 unique / 144 entries
- Remove #86 Lifetime Deals from Revenue (off-brand, kept in Skip note)
- Replace machine-local ~/.claude paths with repo-relative references

AARRR consistency:
- Move signups from Acquisition to Activation per signup boundary rule
- Add explicit signup-intent vs signup-completion distinction

Resumption + state model:
- Define progress.md schema (phase, current_section, plan_version, etc.)
- Replace ambiguous resume condition with explicit decision tree
- Protect finalized plans from silent overwrite (terminal state check)
- Mandate sections/01..13.md as canonical persisted artifacts
- Codify draft order (2..13 then 1, present 1..13)
- Align file layout in SKILL.md with methodology.md

Other:
- Add ## 1. Executive summary header to example-olo.md (was missing)
- Reconcile budget tier numbers ($5-15K canonical, was $5-10K elsewhere)
- Soften verification check to allow documented external skills

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

skills/marketing-plan/references/example-olo.md

@@ -24,6 +24,8 @@ Use this as the "what good looks like" reference when drafting a new plan. The s
 **Date:** 2026-05-27
 **Status:** Draft v1 — for team review
 
+## 1. Executive summary
+
 Olo has built something rare: a clinically validated, brand-coherent, founder-led product in a category that doesn't yet have a name. The opportunity in the next twelve months is not to invent a marketing engine from scratch — it's to **convert the existing organic gravity into a measurable, repeatable funnel**, then layer paid acquisition on top of that funnel once the seed round closes.
 
 **Three big bets, ranked by leverage:**