refactor(acp): rename crate iii-acp -> acp

[guibeira]

Summary

Renames the Rust crate-level identifiers for the ACP worker from the iii-acp / iii_acp prefix to acp. The folder (acp/), worker manifest name: (acp), and CI allowlist entry (acp) were already prefix-free, so only the crate/lib/bin identifiers and their references changed.

This is Task 3 of the in-repo iii-prefix removal plan.

Changes

• acp/Cargo.toml: package name iii-acp -> acp; [lib] name iii_acp -> acp; [[bin]] name iii-acp -> acp.
• acp/iii.worker.yaml: bin: iii-acp -> bin: acp.
• acp/src/** + acp/tests/**: iii_acp:: / use iii_acp lib paths and the iii_acp=... tracing filter -> acp.
• acp/README.md + source comments: iii-acp string references -> acp.
• acp/Cargo.lock: package entry rename + alphabetical re-sort (no dependency version changes).

Out of scope / untouched

• External SDK deps (iii-sdk, iii-observability, iii-state, iii-stream, iii-queue) — unchanged.
• GitHub URLs (github.com/iii-hq/workers), iii-engine keyword/description references — unchanged.

Verification

• cargo build — PASS (acp v0.1.0).
• cargo test — PASS (17 unit + 10 protocol integration tests; no engine required).
• validate_worker.py --worker acp --base-ref main --source-changed '["acp"]' — PASS (exit 0; name=acp matches folder).
• Sanity grep for iii-acp / iii_acp (excluding node_modules, target/) — clean.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
workers	Ready	Preview, Comment	Jun 15, 2026 1:05pm

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[github-actions]

skill-check — worker

0 verified, 18 skipped (no docs/).

Layer	Result
structure	✓
vale	✓
ai	✓
render	✓

Four for four. Nicely done.