MAS-WP-0005-T08: v0.2 stand-ins and resource_id_case in policy; lint; gateway reports canonical form

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Assistant: claude-code
Assistant-Model: opus
Assistant-Process: 252470@bnt-lap001
Assistant-Session: ad628c8f-4be2-4979-94c9-76c7ed6f8241

workplans/MAS-WP-0005-spec-errata-v0-1-1.md

@@ -256,7 +256,7 @@ against its own schema. Discovery accepts both.
 
 ```task
 id: MAS-WP-0005-T08
-status: todo
+status: done
 priority: medium
 state_hub_task_id: "a345e073-04ca-54e1-bac7-837fe7955e4e"
 ```
@@ -266,6 +266,29 @@ The policy interprets `---MODE` (interaction first, enabled mode only) and
 `resource_id_case: insensitive` in the equivalence key. Statute lint covers
 the stand-in constraints. Statute-aware fixtures.
 
+- 2026-10-18 done:
+  - `mas_core.policy.apply_stand_ins` runs first in `resolve()`. It
+    matches the interaction (`---MODE`, enabled mode, last `---`; in the
+    facet or the target) and then the resource (`TYPE--ID`, declared type,
+    first `--`). Everything later (classification, registry,
+    `intake_for`, equivalence) sees the canonical parse, and the parser
+    stays statute-blind.
+  - `AddressSemantics` gains `stand_ins` and `canonical_local_part`; the
+    equivalence key lower-cases resource ids under
+    `resource_id_case: insensitive`.
+  - The gateway event reports the canonical target and base, plus
+    `target_syntax: resource-alternate` when `--` was used, while
+    `local_part` keeps what arrived.
+  - Lint: `stand-in-collision` (registry keys that would change meaning),
+    `stand-in-mode-name`, and `stand-in-without-p2` (warning).
+  - Tests: the spec §6.3 example table, correlation of
+    `ticket--GS-…+comments` with `ticket=gs-…`, intake via `---`, the
+    switch requirement (v0.1, off, no statute), exact id case, and lint.
+    168 tests pass.
+  - A v0.2 statute for mas.coulomb.social lints clean, and the gateway
+    turns `ticket--gs-85qj8wc09p+comments@` into resource
+    `ticket=gs-85qj8wc09p` with facet `comments`.
+
 ## v0.2 sending side: destination transforms in the generator
 
 ```task