CR-035: Align backlog and status after repository hygiene

[coreytshaffer]

CR-035: Backlog and Status Alignment Pass

Status

Implemented

Scope

Update documentation so the public project status matches the merged state
after CR-034.

This change:

• updates docs/current_backlog.md to reflect the post-CR-034 state
• adds CR-034 to the completed safety spine
• distinguishes active identity lifecycle work, model/runtime integrity work,
  and completed repository hygiene work
• checks README proof markers for stale release/status language
• records the change in the changelog

Non-Scope

• Do not implement runtime integrity enforcement.
• Do not expand signing beyond route_audit.
• Do not change packaging or security behavior.
• Do not add new runtime code.

Acceptance Criteria

• docs/current_backlog.md reflects the post-CR-034 state.
• Completed safety spine includes CR-034.
• Current recommendation distinguishes three lanes:
  • identity lifecycle work remains under Issue Add persistent cryptographic agent identities #4
  • model/runtime integrity builds on CR-031 through CR-033
  • repository hygiene baseline from CR-034 is complete
• README has no stale claim that the first release tag is still pending.
• No runtime code changes.
• Full test suite still passes.

Validation

python -m pytest -q
git diff --check
git status --short