refactor(cognition): drop TS slot coord from generateResponse (Rust admits now)

[joelteply]

Summary

Follow-up to #1402. Joel's commit a89c8ab (admit generate-response through Rust resource gate) added ResourceAdmissionGate inside cognition/generate_response.rs::evaluate_response. The TS-side InferenceCoordinator.requestSlot/releaseSlot calls in AIDecisionService.generateResponse were now redundant — double-coordinating the same path.

Per directive: hosts should not coordinate slots outside Rust. This PR removes them.

What changes

• AIDecisionService.generateResponse:
  • Drop InferenceCoordinator.requestSlot / releaseSlot (both success + error paths)
  • Drop messageId / isMentioned options (slot-coord-specific — unused without slot coord)
  • Drop messageId derivation + slot-denied fallback throw
  • Drop LOCAL_MODELS.DEFAULT fallback (Rust evaluate_response carries its own DEFAULT_GENERATE_MODEL constant; passing undefined lets Rust apply its default — single source of truth)
• Drop LOCAL_MODELS import (no longer referenced)
• InferenceCoordinator import kept (still used by evaluateGating + checkRedundancy — those still slot-coord because Rust admission hasn't been extended to those paths yet)

After this PR

generateResponse is a 25-LOC try/catch around a single IPC call — the thinnest possible shim. The slot leak risk codex flagged on #1402 becomes structurally impossible (no slots → no leaks).

Diff

+7 / -30 in 1 file.

Verification

• npm run build:ts — clean
• ESLint baseline held at 5435 (no new errors)
• scripts/ratchet/persona-ts-ratchet.sh check — passes (Lane F ratchet now watches src/system/ai/server after fix(ratchet,#1405): cover AI server cognition shims #1406; deletion is consistent with baseline, no refresh needed)
• Grep verified: zero TS callers of AIDecisionService.generateResponse pass isMentioned or messageId
• CI green

Refs

• feat(cognition,#1385): generate_response PR-3 — TS shim + delete dead TS (PR-4 folded) #1402 — PR-3 of the generate_response oxidizer stack (MERGED)
• a89c8ab — Joel's commit adding Rust ResourceAdmissionGate
• oxidizer: migrate AIDecisionService.generateResponse to Rust cognition/generate-response #1385 — completed oxidizer sub-card (closed)
• fix(ratchet,#1405): cover AI server cognition shims #1406 — Lane F ratchet expansion to src/system/ai/server (MERGED)

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