fix: raise governance file size thresholds for modular files

AGENTS.md stays strict (200) since it's loaded every session.
Modular governance files are lazily loaded per task type, so they
can be larger without impacting token cost:

- rules.md: 300 -> 800 (FPGA/embedded projects have many constraints)
- workflow.md: 300 -> 400
- roles.md: 200 -> 300
- context-budget.md: 200 -> 300
- verification.md: 200 -> 400
- drift-metrics.md: 200 -> 300

Co-Authored-By: Oz <oz-agent@warp.dev>

Author: tbitcs

src/specsmith/auditor.py

@@ -286,14 +286,16 @@ def check_ledger_health(root: Path) -> list[AuditResult]:
 def check_context_size(root: Path) -> list[AuditResult]:
     """Check governance file sizes against thresholds."""
     results: list[AuditResult] = []
+    # AGENTS.md is strict (loaded every session). Modular governance files
+    # are lazily loaded per task type so can be larger.
     thresholds = {
         "AGENTS.md": 200,
-        "docs/governance/rules.md": 300,
-        "docs/governance/workflow.md": 300,
-        "docs/governance/roles.md": 200,
-        "docs/governance/context-budget.md": 200,
-        "docs/governance/verification.md": 200,
-        "docs/governance/drift-metrics.md": 200,
+        "docs/governance/rules.md": 800,
+        "docs/governance/workflow.md": 400,
+        "docs/governance/roles.md": 300,
+        "docs/governance/context-budget.md": 300,
+        "docs/governance/verification.md": 400,
+        "docs/governance/drift-metrics.md": 300,
     }
 
     for rel_path, max_lines in thresholds.items():