docs(research): add PR #39 to fallow.md + mark closed items in competitive-scan

[SutuSebastian]

Two stale spots fixed:

1. fallow.md Adjacent block: added PR feat(show + snippet): targeted-read CLI verbs + MCP tools #39 (targeted-read CLI: show + snippet + security hygiene fixes).
2. competitive-scan-2026-04.md § 4 / § 5: marked PR feat(recipes): recipes-as-content registry — bundled .md + project-local .codemap/recipes/ #37 (recipes-as-content) and PR feat(show + snippet): targeted-read CLI verbs + MCP tools #39 (targeted-read) as ✅ shipped. Both were sitting as 'still backlog' even though their roadmap entries were already removed.

Pure docs honesty. No code change.

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Reviewing files that changed from the base of the PR and between 7460b46 and 29d0e0d.

📒 Files selected for processing (2)

• docs/research/competitive-scan-2026-04.md
• docs/research/fallow.md

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