feat: signals and planning perspective (Masse)

[bokelley]

Summary

• Adds a draft perspective article by Benjamin Masse: "Signals and Planning Are the Agentic Use Case Everyone's Sleeping On"
• Seeds corresponding addie_knowledge entry so Addie can reference the argument
• Key thesis: execution optimization inside platforms is automation, not agentic — the real leverage is upstream signal interoperability via signal catalogs and seller-independent data distribution

What the article covers

• Why signals and planning (not execution) are the transformative agentic use case
• Signal catalogs: data providers publish adagents.json on their own domain, controlling their own context
• Seller-independent distribution: data providers are peers, not subordinates to platforms
• Walled garden nuance: platforms can publish selective catalogs to participate in upstream allocation without commoditizing inventory
• Two-directional shift: buyers escape silos for planning, data providers escape silos for distribution

Expert review incorporated

• Docs expert: added signal catalog mechanism section, fixed get_signals framing (goes to signals agents, not directly to providers)
• Ad creative expert: strengthened seller-independence as the structural argument
• Agentic product architect: added provenance verification angle and long-tail provider unlock
• Code reviewer: fixed doubled single quotes inside dollar-quoted SQL block

Test plan

• All tests pass (1161 passed)
• TypeScript compiles clean
• SQL syntax verified (correct quoting in both dollar-quoted and single-quoted strings)
• Perspective created as draft (Ben can review before publishing)
• Verify perspective appears in admin content UI after migration runs

🤖 Generated with Claude Code