audit: skill + architect + bencher agents migrated

Fourth skill via the boss pattern. audit is the cycle-close
cleanup gate; architect does read-only drift review against
the design ledger; bencher does hypothesis-driven performance
diagnostics.

Profile gains one slot:
- `commands.architect_sweeps` — optional list of project-
  specific architect sweep commands. The architect agent runs
  these in addition to its universal checks; non-zero exit =
  drift suspicions. AILang uses this for the
  bench/architect_sweeps.sh design-honesty / history-anchor
  / lockstep-invariant detector.

The existing `commands.regression` slot now does double duty:
the audit skill walks it in Step 2; the bencher agent reads
the failing script for diagnostics.

Vocabulary substitutions:
- AILang → "this project"
- milestone → cycle
- Boss → orchestrator
- ailang-architect, ailang-bencher → architect, bencher

AILang-specific bits replaced or removed:
- `bench/check.py && bench/compile_check.py && bench/cross_lang.py`
  → `commands.regression` list
- `bench/architect_sweeps.sh` → `commands.architect_sweeps`
- design/INDEX.md / design/contracts/ / design/models/
  → `paths.design_ledger` / `paths.design_contracts` /
    `paths.design_models`
- `bench/run.sh`, `bench/orchestrator-stats/`, `runtime/rc.c`,
  `runtime/bump.c` (in bencher) → generic harness / production-
  path references
- RC + uniqueness + bump + implicit-mode/explicit-mode
  framework (the entire AILang allocator-comparison
  calibration) → generic "cost-paying variant vs control"
  framing; the hypothesis examples generalised to abstract
  perf claims
- The two specific lockstep invariants in architect
  (Pattern::Lit::* ↔ pre_desugar_validation; lower_app ↔
  is_static_callee) → "the project's CLAUDE.md enumerates
  the known pairings; walk each one against the cycle diff"
  (the concrete pairings stay AILang-only, in AILang's
  CLAUDE.md, not in the plugin)
- The Floats fieldtest "B1 canonical example" reference →
  dropped (AILang-specific anchor)
- `design/contracts/0007-honesty-rule.md` cross-ref → dropped
  (AILang-specific contract); the honesty principle survives
  in the architect's commit-body-truthfulness check

Universal substance preserved verbatim:
- All three Iron Law clauses for audit, architect, bencher
- audit's four-step process; architect's eight-step process;
  bencher's hypothesis-first methodology + fixture-pairing
  rule + honesty rules
- audit + architect + bencher exit code 0/1/2 semantics
- All Common Rationalisations (5/6/8) and all Red Flags
  (5/6/7) rows across the three files, vocabulary-substituted
- bencher's "tie is not a result" doctrine intact

Bencher is the most language-coupled of the seven (was
AILang-allocator-specific). Generalised to a performance-
benchmarker; the discipline (hypothesis-first, design-against
not around, ties-are-bench-info) survives intact. AILang's
RC+bump examples kept in spirit via the generic "cost-paying
vs control" framing.

docs/profile-schema.md

@@ -47,6 +47,7 @@ take the next-higher number; deleted files retire their number.
 | `lint`         | string | (optional)     | Lint command — exit 0 means success. |
 | `doc_build`    | string | (optional)     | Documentation-build command used by the `docwriter` skill. Should print warnings on stderr so the agent can enumerate them (e.g. `cargo doc --no-deps 2>&1`). Omit if the project has no API docs. |
 | `regression`   | list   | `[]`           | Regression scripts run by the audit skill. Each entry is a shell command; non-zero exit is a regress. |
+| `architect_sweeps` | list | `[]`         | Project-specific architect sweep commands run by the `architect` agent in addition to its universal checks. Each entry is a shell command; non-zero exit means at least one sweep matched and the matches are drift-suspicions to verify. Optional. |
 
 ## `vocabulary`