chore(acp): bump dimcode and grok registry pins to probed versions - #973

Summary

Scheduled ACP Registry version sync. Two npx pins drifted since #971, each backed by a fresh serial ACP probe of the exact pinned version. This is a single-file diff: neither outgoing version appears in any test assertion, and codebuddy — the only package whose version is embedded in one — did not drift.

Both meet the release-lock criterion: initialize succeeds and session/new returns a clearly classified authentication requirement. Probes ran serially with no inherited HOME or credentials. dimcode still self-reports agentInfo.title as "DimAgent" against a public listing of "DimCode" — a standing vendor quirk, not an AionCore defect.

Snapshot structural diff: the previous snapshot (v2026.09.07-50f99cd, audited earlier the same day) was still on disk, so the per-agent comparison ran. Across all 39 agents the only changes are these two npx package versions — no distribution type added or removed, no args/env change anywhere, and no binary artifact movement this window. Nothing outside the lock needed reporting.

Derived-assertion scan: both outgoing versions (0.3.28, 1.0.21) were scanned across crates/**/*.rs with fixed-string matching before staging; neither has a single hit. registry_npx_lock.rs still pins codebuddy at 2.146.0, which is correct for this snapshot. npx_cache_repair.rs keeps its own version literals: those are cache-path hash fixtures, not lock assertions.

The other 9 Registry-pinned packages (autohand, codebuddy, deepagents, dirac, glm-acp-agent, kilo, nova, pi, sigit) match the snapshot exactly. Drifted but not upgraded: none. mimo-code remains the one non-Registry builtin (no registry_json_id), excluded from drift reconciliation.

Standing watch (unchanged, no action in this PR): sigit's ACP probe announced an npm scope rename (@smbcloud/sigit → @getsigit/sigit) on 2026-09-07. The Registry still declares the old scope, so the pin is untouched; the eventual switch needs a metadata migration alongside the lock, because agent_metadata seeds the launch args as ["-y","@smbcloud/sigit"] (migration 025). That will be a human-reviewed PR.

Registry snapshot

• Audit pinned to release tag v2026.09.07-aafb17a of agentclientprotocol/registry, fetched via the versioned CDN path for reproducibility.
• 39 ids in the raw snapshot: no newly listed and no delisted agents versus the baseline. (antigravity-acp remains listed and deferred as binary-only since 2026-08-21; fast-agent and minion-code remain listed but uvx-only and therefore out of scope.)

Validation

• just migration-check — pass
• just lint-fix (cargo fix + clippy --fix --workspace -D warnings) — clean
• just fmt — clean
• Local cargo nextest intentionally skipped, by standing policy for lock-only bumps (established 2026-08-11). The Test check on this PR is the authority for this change: the merge decision depends on CI rather than the local run, and this host's load only manufactures timeout-shaped test failures, which nothing in the local steps above is subject to.

Logging

No logging changes: this is a lock version bump only; existing startup/session error paths already identify a failing agent by backend.