v0.1.23 — remove dead Phase 6 env-path sed step

Removed

• Extractor's Phase 6 ~/.daily-agents.env → ~/.second-brain-os.env sed step — added in v0.1.20 to compensate for 72e9129 (which had drifted the atlassian-skill env paths to .daily-agents.env). Since fca6c97 reverted the source files back to .second-brain-os.env directly, the sed had become a no-op. 12 lines of dead defensive code removed. Phase 10's daily-agents leakage scan still catches accidental regressions if any future commit reintroduces the wrong path.

Notes

• Extractor-only change. No skill bodies, hooks, root docs, or installer affected.