feat(#868): grant first_clear on a completed map-node replay

[zgeoff]

Description

Closes #868

applyMatch in the replay worker now grants a first_clear when a verified segment's last
replayed checkpoint is a completed terminal on a world_map_node scope, spread into the
existing applyVerifiedSegment call alongside items/chain.

• Gate is narrower than isForwardExited: a fail, stop, or cap forward-exits the chain without
  clearing a node, documented with a // comment.
• Compares the checkpoint's type field against the string literal 'completed' rather than the
  ActivityCheckpointType enum — oxlint's type-aware no-unsafe-enum-comparison rejects the enum
  form here, matching is-forward-exited.ts's existing style.
• avatarGrants's upsert semantics make re-verifying an already-granted node a no-op.

Testing

• bun run typecheck passes
• bun run test passes
• bun run lint passes
• New tests added for new functionality

Five new tests in run-frontier.test.ts cover: a completed map-node run grants first_clear
keyed by scopeID; a failed terminal grants nothing; a mid-run stopped forward-exit grants
nothing; a completed terminal on a non-map-node scope grants nothing; re-verifying an
already-granted node lands no duplicate row.

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