convention: counter-prefix file naming across docs/specs/, docs/plans/, design/contracts/, design/models/

All 176 files in the four accumulating directories now use a
zero-padded 4-digit counter prefix that reflects creation order
(`NNNN-slug.md`). The counter is assigned per directory in strict
git-log creation order; ties broken alphabetically by original name.
The old `YYYY-MM-DD-` prefix on docs/specs/ and docs/plans/ files is
dropped — the date is recoverable from git log and the counter
carries the ordering.

A file's counter is stable for the life of the file: never reassigned,
never reused, never compacted. Deleted files retire their counter;
subsequent files do not fill the gap. This is the property that lets
cross-references stay literal — refs use the full filename including
the counter (`design/contracts/0007-honesty-rule.md`) so they grep
cleanly and resolve directly without a glob step.

313 cross-references updated across .md/.rs/.toml/.c/.json files
(test pins, include_str! paths, design-INDEX entries, baseline notes,
runtime C comments, inter-contract markdown links incl. bare basename
and `../models/foo.md` forms).

CLAUDE.md gets a new "File-naming convention" section spelling out
the rule and rationale. skills/brainstorm/SKILL.md and
skills/planner/SKILL.md updated so new spec/plan creation produces
counter-prefixed names from the start.

The full test suite (cargo test --workspace) passes.

crates/ail/tests/embed/record_roundtrip.c

@@ -1,6 +1,6 @@
 /* Embedding-ABI M3 record round-trip C host (own + borrow via a
  * compile-time -DBORROW switch). Frozen value layout
- * (design/contracts/frozen-value-layout.md):
+ * (design/contracts/0006-frozen-value-layout.md):
  *   p - 8 .. p   uint64_t refcount header (set to 1 by ailang_rc_alloc)
  *   p + 0        int64_t  constructor tag (single ctor → 0)
  *   p + 8        IEEE-754 double  field 0 = Float acc