v2.9.8

The Stop hook can no longer block you over another project's files, even if
its ledger is wrong. 2.9.7 fixed how the ledger is named; this release makes
the outcome independent of the ledger being right.

• The Stop hook names only files inside the current project. A ledger holding
  another repository's paths, for any reason, cannot block here.
• With no session id the hooks record nothing and block nothing. The shared
  local fallback name, the root of the cross-session leak, is gone.
• SessionStart deletes the shared ledgers left by 2.9.6 and earlier
  (edited-local.jsonl, edited-<tag>-local.jsonl), so no manual cleanup.

Three new hook tests, one per guarantee, each failing against 2.9.7.

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