CLIAdapter.Occupancy called a.Usage(s.PaneID), but ClaudeUsage/CodexUsage/
OpenCodeUsage all take a filesystem path to session state, not a herdr pane
id. Every call failed with "open <pane-id>: no such file", and
Coordinator.rotate silently `continue`d past every failure, so occupancy
always looked unmeasurable and rotation never fired.
Add herdr.Session.SessionFile and CLIAdapter.resolveSessionFile:
- claude: ClaudeSessionFile resolves the transcript by newest-mtime under
Claude Code's own encoded project directory
(~/.claude/projects/<abs-worktree-with-/-as-minus>/*.jsonl). This is the
Phase-1 fallback; the Stop hook's transcript_path (Phase 2) is the
authoritative source once wired.
- codex: routes through the existing CodexActiveUsage sqlite/rollout
discovery instead of the pane id.
- opencode: resolution needs a live session id from the SSE/status API,
not derivable from the worktree alone — refuses loudly with a pointer
to AUDIT.md Phase 1 rather than guessing a path, per the spec's "verify
against a live session before wiring any trigger" (§5.2.1).
A missing/unreadable session file is now a hard error, not a silent
zero-usage Usage{}. SessionHealth gained Occupancy/OccupancyError fields,
populated every refreshSessionHealth tick, so GET /v1/tasks/{id}/health
makes the number rotation decides on observable before trusting it.
Tests: TestClaudeUsageIsLastTurnNotCumulative guards the exact trap named
in §5.2.1 (large early-turn total, small last-turn usage -> low occupancy).
TestClaudeSessionFileNewestByMtime and TestClaudeSessionFileMissingIsHardError
cover the resolver.
AUDIT.md B1. Live verification against a real Claude Code session (the
spec's own acceptance bar for this phase) still needs to happen on a host
with an actual session — not possible from this sandbox.
kami
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