fix(sdk): lock registerToolSessionTransitionCleanup out of public inventory

[innocarpe]

Summary

Follow-up to #3813. Current dev fails SDK operation inventory > accepts the committed generated matrix with:

Pending review source seam: agent_session:registerToolSessionTransitionCleanup

AgentSession.registerToolSessionTransitionCleanup is an internal tool/session lifecycle registration seam used for shared artifact-manager ownership across transitions. It is not a user-facing SDK control (same class as registerToolSessionCleanup, already locked out).

Changes

• Add agent_session:registerToolSessionTransitionCleanup to LOCKED_EXCLUSIONS in generate-sdk-operation-inventory.ts.
• Regenerate operation-inventory.generated.json.

Why this matters

Any exact-head PR based on current dev that runs coding-agent shard inventory checks inherits this red, including notification PR #3834 (whose own generation guard and package check are green). Owner review of #3834 classified this as a pre-existing base regression that still must be green on the exact head before merge.

Test plan

• bun test packages/coding-agent/test/sdk-operation-inventory.test.ts — 17 pass
• bun packages/coding-agent/scripts/generate-sdk-operation-inventory.ts --check
• Full Dev CI coding-agent shards (expected green after this lands)

Scope

• Refs #3813 only — inventory classification, not a behavior change.

[Yeachan-Heo]

Red-team read-only review: SDK inventory exclusion seam

Head SHA verified: db9ad498763ffa6ffbba5573bc431cab246b559f

Scope

2 files, +13 lines:

• generate-sdk-operation-inventory.ts — adds agent_session:registerToolSessionTransitionCleanup to LOCKED_EXCLUSIONS
• operation-inventory.generated.json — regenerated committed matrix

Validation performed

1. Locked exclusion is internal — ✅
registerToolSessionTransitionCleanup (agent-session.ts:3413-3418) is a #private-backed lifecycle registration that adds a cleanup callback to this.#toolSessionTransitionCleanups. It has no SDK adapter mapping, no user-facing control surface, and is parallel to the already-excluded registerToolSessionCleanup (line 3407, excluded at generator line 38). The rationale string accurately describes its purpose: "internal tool transition cleanup registration for shared artifact-manager ownership."

2. Generator output matches committed JSON — ✅

bun scripts/generate-sdk-operation-inventory.ts --check → exit 0
bun test test/sdk-operation-inventory.test.ts → 17 pass, 0 fail

The --check mode confirmed the committed operation-inventory.generated.json is byte-identical to what the generator produces from the updated LOCKED_EXCLUSIONS. No drift.

3. CI status — ✅
14 SUCCESS, 6 SKIPPED, 0 FAILURE. Mergeable.

Verdict

Clean mechanical exclusion of an internal lifecycle seam introduced by #3813. The generator and committed matrix are in sync. No public SDK surface is exposed or removed.

Approved.

— gaebal-gajae