chore: expand v2.3.0 release notes with budget/growth/team frameworks

The budget-planning, growth-patterns, and team-and-agency-model
reference files were intended to ship with the original v2.3.0
release but were added in a follow-up PR (#341). Updating the
v2.3.0 release notes paragraph in VERSIONS.md so the published
v2.3.0 description matches what the release actually contains
when the tag is moved to include the follow-up content.

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

VERSIONS.md

@@ -52,7 +52,7 @@ Current versions of all skills. Agents can compare against local versions to che
 
 ### 2.3.0 (2026-05-27)
 
-- Added `marketing-plan` skill — comprehensive AARRR-structured marketing plan generator. Produces a 13-section Notion-paste-ready plan document (executive summary, strategic frame, current state, AARRR breakdown, 90-day roadmap, 12-month outlook with funding-stage capability unlocks, marketing operations stack mapping skills + MCPs to AARRR stages, tactical idea bank cross-referencing all 139 `marketing-ideas` to AARRR + client-specific status, measurement framework, RACI, open decisions). Customized for current budget, team, stage, and tooling stack. Three-phase workflow: INIT (research + intake), REVIEW (section-by-section walkthrough), FINALIZE (compile + verify + optional publish to shared repo). References include methodology, plan-template, aarrr-framework, current-state-rubric (self-contained 17-section scoring rubric), ops-stack-mapping, idea-cross-reference (139-idea AARRR mapping), funding-stage-unlocks, measurement-framework, client-types (variations by B2B SaaS / D2C / hardware-hybrid / marketplace / dev tool / clinical / commerce), and example-quietude (anonymized canonical reference plan, based on a real fCMO engagement with names/identifying details changed).
+- Added `marketing-plan` skill — comprehensive AARRR-structured marketing plan generator. Produces a 13-section Notion-paste-ready plan document (executive summary, strategic frame, current state, AARRR breakdown, 90-day roadmap, 12-month outlook with funding-stage capability unlocks, marketing operations stack mapping skills + MCPs to AARRR stages, tactical idea bank cross-referencing all 139 `marketing-ideas` to AARRR + client-specific status, measurement framework, RACI, open decisions). Customized for current budget, team, stage, and tooling stack. Three-phase workflow: INIT (research + intake), REVIEW (section-by-section walkthrough), FINALIZE (compile + verify + optional publish to shared repo). References include methodology, plan-template, aarrr-framework, current-state-rubric (self-contained 17-section scoring rubric), ops-stack-mapping, idea-cross-reference (139-idea AARRR mapping), funding-stage-unlocks, measurement-framework, client-types (variations by B2B SaaS / D2C / hardware-hybrid / marketplace / dev tool / clinical / commerce), example-quietude (anonymized canonical reference plan, based on a real fCMO engagement with names/identifying details changed), budget-planning (two scientific methods for setting the marketing budget — Revenue-Based 5–40% of ARR, and Goal-Based formula reverse-engineered from the revenue target; plus blended CAC calculation, the 10–20% experimental buffer rule, the 3-3-2-2-2 VC growth path, and the forecasting reality check), growth-patterns (the real shape of SaaS growth — $0–10K / $10K–100K / $100K–1M phases with binding constraints, linear vs step-function vs S-curve patterns, and Channel × Product × Market layering), and team-and-agency-model (the strategy-in-house / execution-outsourced principle, three core functions Growth/Product/Content, π-shaped marketer framework, title progression Manager → Lead → Director → VP → Chief, agency selection framework, and the three-stage scaling model Early/Growth/Scale). Budget, growth-pattern, and team frameworks drawn from *Founding Marketing* by Corey Haines.
 - Total skills: 43.
 
 ### 2.2.0 (2026-05-26)