fix(ci): resolve A2ML manifest baseline failure (Refs #87) (#112)

## Summary

Two `.a2ml` files outside `.machine_readable/` were failing
`hyperpolymath/a2ml-validate-action` with `Missing required identity
field (agent-id, name, or project)`:

- `.boj/project-memories.a2ml`
- `cartridges/007-mcp/schemas/memory-tag-map.a2ml`

Both files use S-expression body shape (`(memory-tag-map …)` /
`(project-memories …)`) which the validator's line regex
`^\s*(name|agent-id|project)\s*=` cannot match.

## Fix

Added a TOML-shape `[identity]` preamble to each file exposing `name`,
`project`, `version`, and `schema_version` to the regex. The TOML lines
are benign for downstream consumers:

- `cartridges/007-mcp/ffi/oo7_mcp_ffi.zig::matchMemories` skips every
line until it sees `(tag …)` (`if (!in_memories) continue;`), so
non-`(…)` lines never enter the parse path.
- `.boj/project-memories.a2ml` is purely informational — `cat`'d into
Claude worker session briefings.

## Test plan

- [ ] CI: Dogfood Gate / `Validate A2ML manifests` green
- [ ] CI: no regression on `Empty-linter`, `Groove manifest check`,
`Validate eclexiaiser manifest`

Refs #87.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: hyperpolymath

.boj/project-memories.a2ml

@@ -5,6 +5,16 @@
 ; Auto-prepended to every Claude worker session via claude() shell hook.
 ; Media-Type: application/a2ml
 
+; ── Identity (required by hyperpolymath/a2ml-validate-action) ─────────
+; TOML-shape preamble exposes name/version to the line-regex validator.
+; Consumers of the s-exp body below ignore non-`(...)` lines, so this
+; header is benign for the claude() shell-hook cat-and-prepend pipeline.
+[identity]
+name = "project-memories"
+project = "boj-server"
+version = "1.0.0"
+schema_version = "1.0.0"
+
 (project-memories
   (version "1.0.0")
   (repo "boj-server")

cartridges/007-mcp/schemas/memory-tag-map.a2ml

@@ -23,6 +23,17 @@
 ;;
 ;; The adapter resolves those against $HOME at OnEnter time.
 
+;; ── Identity (required by hyperpolymath/a2ml-validate-action) ─────────
+;; TOML-shape preamble exposes name/version to the line-regex validator.
+;; The Zig consumer (cartridges/007-mcp/ffi/oo7_mcp_ffi.zig matchMemories)
+;; only honours `(tag …)` / `(memories …)` blocks, so non-`(` lines here
+;; are skipped by `if (!in_memories) continue;` at the parse loop.
+[identity]
+name = "memory-tag-map"
+project = "007-mcp"
+version = "0.1.0"
+schema_version = "1.0.0"
+
 (memory-tag-map
   (version "0.1.0")
   (generated-for "007-lang")