CLI: unify command surface in ccusage style (flags/ergonomics, not scope) #4

Part of #2 (umbrella). Layer-1 CLI is merged (#1): src/cli/analyzeSession.ts and src/cli/sessionInventory.ts each carry their own ad-hoc flag grammar. This issue aligns the command surface with ccusage conventions so both tools feel like one CLI — without importing ccusage's scope.

Scope boundary (hard)

• ccusage = macro usage aggregates (daily/weekly/monthly/blocks) across many agent sources, statusline.
• claude-devtools = deep per-session audit of Claude Code sessions (ledger, waste findings, subagents, inventory).
• Do not add: daily/monthly/blocks aggregates, multi-agent sources, statusline hooks, pricing-sync network logic. Complementary tools, zero feature mixing.

What to do

1. Unified flag grammar across both commands, matching ccusage semantics:
   • --json — already present in both; keep as the single machine-readable mode
   • --breakdown — per-model token/cost breakdown (new)
   • --since / --until — date-range filtering (new; applies to analyze:sessions list and analyze:session turn filtering)
   • --last N — relative shortcut for --since (new)
   • --no-cost — hide cost columns / JSON cost fields (new)
   • existing flags stay: --project, --min-minutes, --sort, --limit, --subagent-min-minutes
2. Shared arg parsing + help/exit-code/table conventions so both commands behave identically (small shared module under src/cli/, no new dependencies). Keep script names analyze:session / analyze:sessions stable — issue [FEAT] Layer 2: package the CLI as a Claude Code plugin (marketplace + plugin.json + skills) #3's skills reference them; a unified analyze entrypoint is optional only if it is near-zero extra code.
3. README section for the CLI: usage, examples, and explicit positioning vs ccusage (one paragraph, the boundary above).
4. Tests: extend test/main/cli/analyzeSession.test.ts, add coverage for inventory flags (test/main/cli/sessionInventory.test.ts).

Files

• src/cli/analyzeSession.ts, src/cli/sessionInventory.ts
• new src/cli/args.ts (or similar shared parser) only if it removes duplication
• test/main/cli/analyzeSession.test.ts, test/main/cli/sessionInventory.test.ts
• README.md

Acceptance criteria

• Both commands support the unified flag set with ccusage-compatible semantics
• pnpm analyze:session --help / pnpm analyze:sessions --help consistent (usage, exit codes, table rendering)
• README documents both commands + ccusage positioning
• pnpm typecheck && pnpm lint && pnpm test green; no app-build changes; existing pnpm analyze:* invocations keep working

Implementation

Use the ponytail skill (/ponytail): shortest working diff, no new dependencies, no speculative abstractions — shared parser only if it measurably removes duplication.

Оценка

• LOC: ~250–450 (src ~120–250 / tests+README ~130–200)
• Размер: M–L
• Время (код): ~40–90 мин
• Время (review): ~15–30 мин (чисто логический CLI-код, security-множителей нет)
• Время (итого): ~55–120 мин