Metaprompt removal

META_PROMPT.md is no longer part of the agent runtime contract or the search corpus. The MCP server delivers stable protocol guidance through InitializeResult.instructions and each tool description.

The removed bootstrap path required a host session ID and a special retrieve call before any other memory operation. It duplicated protocol state across an adapter hook, an MCP session object, an attestation log, and a special authority resource. The current activate, load, and store tools have no compatibility dispatch for that path.

The removal migration rewrites affected Commit chains with Trees that omit the obsolete resource, advances every dependent Ref and draft base to the rewritten Commit, removes related drafts and reviews, and then drops the Metaprompt table. The daemon schema migration removes local Metaprompt drafts and operations while preserving Context, Rule, and Workflow drafts. Because Server Commit IDs change, it also resets rebuildable Commit and search caches, removes old materialized generations, and replays remote Draft projections so preserved drafts receive their rewritten base Commit IDs. No compatibility type, endpoint, or local record remains after migration.

The removed bootstrap content is protocol instruction rather than durable memory, so it is deleted instead of reclassified. Long-lived behavioral constraints belong in Rules, reusable procedures belong in Workflows, and background material belongs in Context.

See MCP for the current wire contract and Runtime for the daemon-owned Effective Memory path.