P2 — Fix POSIX retarget symlink removal

[LogicDuke]

Finding: CURRENT / P2

Affected parent:

• PR P3 — Split control CLI executable entry wrapper #99
• repair/pr84-cli-entry-alias
• parent HEAD: a5837df

Repair:

• commit: 990bcc7
• subject: test(control): unlink POSIX retarget symlink

Defect:
The retarget regression hook used rmdirSync(alias) for both Windows junctions
and POSIX directory symlinks. On POSIX this can fail with ENOTDIR before the
alias is retargeted, so the adversarial regression does not execute correctly.

Repair mechanism:

• Windows junction removal remains rmdirSync
• POSIX symlink removal uses unlinkSync
• retarget timing unchanged
• retarget-happened assertion unchanged
• DECOY assertion unchanged
• silent-exit-0 assertion unchanged
• production code unchanged

Validated candidate:

• changed files: 1
• patch SHA256:
  1AB2E0C41833D1BA5245C83F0CC61E81611CF8B661236C32E31C9E0654745A03
• patch bytes: 1315

Validation:

• fresh independent validation: PASS
• focused retarget test: PASS
• launch-lifecycle test: PASS
• tests/control with real Windows native helpers: PASS
• full suite forks-single: PASS
• typecheck: PASS
• lint: PASS
• build: PASS
• git diff --check: PASS

Scope:

• tests/control/launch-lifecycle.test.ts only
• no production changes
• no CI changes

Separate finding:
A CURRENT/P3 Ubuntu CI coverage gap exists and is intentionally NOT repaired in
this PR.

This is a DRAFT nested validation PR beneath PR #99.
It MUST NOT be merged directly to PR #84 or main.

🤖 Generated with Claude Code

https://claude.ai/code/session_01W4mov2nqq6V54r3RAD6amh

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