docs(track-a): close current client fence task

[blakinio]

Objective

Complete the mandatory post-merge lifecycle closeout for OTC-20260819-track-a-current-client-fence-advance after source PR #555 merged.

Terminal source facts

source_pr: 555
source_final_head: 1f06f6a36683f3a1c5e92570439e89854b7876b5
source_base: cf90b84442dda730bdab93d8aa9f3236b7532ad8
source_merge: 2e572789a2bc4b64c5e906c4515c15c625f6bc9e
source_ci: 32230716243 success
track_a_agent_runtime_governance: 32230716017 success
track_a_canonical_live_governance: 32230716102 success
track_a_xres_identity: 32230715990 success
independent_audit_review: 4969851925
open_material_findings: 0
review_threads_open: 0

Closeout changes

• move the task from docs/agents/tasks/active/ to docs/agents/tasks/archive/;
• mark status: completed, session_role: released, ownership_released: true;
• persist exact merge/CI/audit/provenance facts in task-owned closeout evidence;
• record that the temporary restack ref was deleted;
• preserve the later-invocation boundary for PR research(track-a): validate economy panels read-only runtime #550.

This PR is documentation/lifecycle-only. It performs no live runtime action, credential use, login, GUI input, gameplay, transaction, process control or client mutation. E2E is NOT_APPLICABLE for this closeout.

Expected diff: exactly 3 paths — add archive, add closeout evidence, delete active task.

[blakinio]

Fresh independent lifecycle closeout audit on exact head 1f5e924ab906badc559132b95c9c57bc22c7375a, base main@2e572789a2bc4b64c5e906c4515c15c625f6bc9e.

Result: PASS; open material findings: 0.

Fresh detached-worktree documentation falsifier independently verified:

• exactly 3 changed paths: add post-merge evidence, delete active task, add archive task;
• git diff --check PASS;
• active task path absent and archive path present;
• archive has status: completed, session_role: released, ownership_released: true, runtime_access: none, mutation_authorized: false, e2e_result: NOT_APPLICABLE;
• source PR/head/base/merge are exactly #555 / 1f06f6a36683f3a1c5e92570439e89854b7876b5 / cf90b84442dda730bdab93d8aa9f3236b7532ad8 / 2e572789a2bc4b64c5e906c4515c15c625f6bc9e;
• source exact-head checks are recorded exactly: CI 32230716243, agent-runtime governance 32230716017, canonical-live governance 32230716102, XRes identity 32230715990, all SUCCESS;
• source independent audit review 4969851925 is recorded as PASS with zero material findings;
• the temporary restack ref is recorded deleted;
• added-line scan introduces no login/credential/gui-input/gameplay/transaction/process-control/mutation authorization set true;
• PR #550 remains explicitly outside this closeout and may consume the new trusted fence only from a later invocation after fresh admission.

No live runtime action occurred in this audit.