restructure: AGENTS.md canonical + docs/guides with .claude/rules symlinks

Rename CLAUDE.md -> AGENTS.md (cross-vendor standard) with a relative
CLAUDE.md symlink so Claude Code still loads it. Move each .claude/rules
file into docs/guides/ (paths: frontmatter preserved) and replace the
rules file with a relative symlink into the guide. Repoint the AGENTS.md
index paragraph at docs/guides/ so non-Claude agents find the guides.

.claude/rules/startos-package.md

@@ -1,31 +0,0 @@
----
-paths:
-  - "package/**"
----
-
-# StartOS package (`package/`)
-
-TypeScript wrapper that ships the Docker image as an s9pk. `@start9labs/start-sdk` pinned `1.3.3`, Node ≥22, bundled by `@vercel/ncc`.
-
-## Commands
-
-```bash
-cd package
-npm i          # one-time
-make x86       # typecheck + ncc bundle + docker build + pack → spark-control_x86_64.s9pk
-make install   # sideload to the Start9 server; needs "host: http(s)://<server>.local" in ~/.startos/config.yaml
-npm run check      # tsc --noEmit — run after any startos/ edit; make x86 also runs it
-npm run prettier   # prettier --write startos (no semicolons, single quotes, trailing commas)
-```
-
-`make aarch64` for ARM Start9 servers. `make install` picks the newest `*.s9pk` in `package/` and restarts the live spark-control service — get a go/no-go first.
-
-## Versioning & release notes
-
-- Version format is `X.Y.Z:N` (`:N` = revision). Bump in `package/startos/versions/v0_1_0.ts`; **replace** the release notes — never leave old notes behind under an extra key (any unknown key fails `tsc`).
-- New external-facing endpoints get noted in release notes for downstream app developers (Recap Relay, Ten31 Transcripts, CRM, Signal Engine consume these APIs).
-
-## Layout
-
-- `package/startos/` — manifest, interfaces, actions (`configureSparks`, `showPublicKey`), `versions/v0_1_0.ts` (current version string + release notes).
-- The "Reapply speech-model patches" action is **not** a StartOS action — it's a dashboard action implemented in `image/app/speech_models.py`.

.claude/rules/startos-package.md

@@ -0,0 +1 @@
+../../docs/guides/startos-package.md