[recipes] Add Bring Your Own Context composition recipe

[justfinethanku]

What changed

This PR adds a new Bring Your Own Context composition recipe that packages the existing OB1 context extraction, profile generation, and remote MCP deployment flow into one article-friendly entrypoint.

It adds:

• recipes/bring-your-own-context/README.md
• recipes/bring-your-own-context/extraction-prompts.md
• recipes/bring-your-own-context/context-profile.schema.json
• recipes/bring-your-own-context/metadata.json

It also adds discoverability links from the root recipes listings and points the existing Work Operating Model Activation recipe back to the BYOC entrypoint.

Why it changed

The new post promises publish-time tooling for extracting prompts, profile specs, and implementation guidance around a portable AI context server. The strongest OB1 version of that promise is a composition recipe built from the existing Work Operating Model and remote MCP primitives rather than a second overlapping server stack.

User impact

Users now have one canonical entrypoint for the BYOC workflow:

• run extraction prompts to seed Open Brain with durable context
• reuse the existing Work Operating Model workflow to normalize that context
• export a documented portable bundle consisting of operating-model.json, USER.md, SOUL.md, HEARTBEAT.md, and schedule-recommendations.json

Validation

• Parsed recipes/bring-your-own-context/metadata.json
• Parsed recipes/bring-your-own-context/context-profile.schema.json
• Ran npx markdownlint-cli2 recipes/bring-your-own-context/README.md recipes/bring-your-own-context/extraction-prompts.md
• Verified the schema export keys match the ARTIFACTS list in recipes/work-operating-model-activation/index.ts
• Verified the local links in the new BYOC docs resolve

Live testing

Not yet tested against a live Open Brain instance in this push. This PR currently includes static validation and documentation/schema alignment checks only.