Fix claude-code usage-ingestion freeze (Workflow "failed" rows) + add Weekly plan receipt row

[mikehasa]

Two independent fixes surfaced while dogfooding the app.

1. Fix: claude-code usage ingestion frozen by Workflow "failed" journal rows

The Claude Code Workflow tool writes a metadata journal at
<project>/<root>/subagents/workflows/wf_*/journal.jsonl. It now emits a third
row type — {"type":"failed","agentId":...,"key":...} — when a workflow agent
dies. The metadata-only validator (_validate_claude_workflow_journal)
recognized only started/result, so a failed row raised
claude_workflow_journal_schema_drift.

That validation runs before any transcript is parsed and fails closed for the
whole home, so a single unrecognized journal row aborted the entire claude-code
usage scan. Effect: usage/cost ingestion stopped (parsed=0, consecutive
failures climbing) while already-stored sessions kept rendering — the source
showed "degraded / 1 error" with no visible loss of sessions.

Fix: accept failed as a known no-usage lifecycle row. Keys stay exact-set, so
a journal row carrying token usage still fails closed (the safety guard is
unchanged). Regression test added.

2. Feature: a dedicated "Weekly plan" receipt row

The Task's calibrated share of its client's weekly plan already rides the
receipt as dimensions.cost.plan_share, but was shown only as a suffix on the
macOS Cost line and not at all on the CLI/TUI. Promote it to its own "Weekly
plan" row across the macOS app, CLI and TUI (the API payload already carries
it). No calibration or computation changed.

Wording is single-sourced (receipt.plan_share_headline /
ReceiptPlanShare.rowSummary) and stays calibrated-or-nothing: a percentage
only once calibrated, otherwise a named calibration state, never a fabricated
number. The now-duplicate share suffix is dropped from the macOS Cost row and
cost KPI tile.

Tests

• pytest full suite: 2658 passed.
• swift test (macOS app): 164 passed.
• Added: workflow-journal failed-row acceptance; plan_share_headline state
  coverage; "Weekly plan" row assertions in the CLI/TUI renderer tests.