CB-634: finish the bridge_* -> fleet_* tool rename in docs and comments

The alias removal left bridge_* tool names in prose. Fix them:
- README no longer claims the old bridge_* names still answer (they were removed).
- pom + LeadTabScanner comments name fleet_* tools.
- FleetMcp comment no longer mentions the removed deprecated twin.
- docs/MCP-Contract.md and e2e swept bridge_* -> fleet_*; e2e ask files renamed.
The historical mcp__bridge__* mount-name note in CLAUDE.md is kept on purpose.
949 tests pass.

e2e/fleet_ask_transcript.md

@@ -0,0 +1,12 @@
+# Live fleet_ask — reverse rendezvous — 2026-07-16 16:30
+
+One worker paused its delegated turn to ask the primary, then resumed with the answer (profile `default`). Result: **`OK`**.
+
+## Round-trip
+
+1. **primary → worker** (delegation): the ask-forcing task.
+2. **worker → primary** (`fleet_ask`, 6.6s): 'PICK A COLOR: red or blue?' — surfaced on the primary's blocked send as a `question` with `turnId=term_656bb47d2c42a9e#1`.
+3. **primary → worker** (answer on that turn): `blue`.
+4. **worker → primary** (`fleet_reply`, 7.9s, source=reply): 'CHOSEN=BLUE'
+
+> **OK:** asked, resumed the same turn, and the reply reflected the primary's answer