…code (#154)

* docs(behavior-parity): audit slash-command + CLI-flag tables against code

Reconcile docs/BEHAVIOR_PARITY.md with the actual source. Verified every row
in the Slash-commands, CLI-flags, and Tools tables by grepping the code rather
than trusting the doc.

Slash commands (apps/cli/src/commands.ts BUILTIN_COMMANDS):
- /init  🔄 → ✅  — runInitFlow is a real 3-phase REPL flow (scan → draft →
  approve-write AGENTS.md), wired in repl.ts; no longer a stub.
- /bug  ✗ → ✅  and  /release-notes  ✗ → ✅  — both registered since PR #150.
- /upgrade  ✓/🟡 → ✗/🔄  — there is no /upgrade slash command; it is the
  `deepcode upgrade` CLI subcommand (cli.ts) that prints an upgrade hint.
- add missing rows: /diff (✅, PR #150) and /keybindings (🆕, DeepCode-only).
- /effort wording: CLI prints the EFFORT_PARAMS-derived tier table (PR #147).
- header count ~20 → ~28 shipped.
- genuinely-missing commands kept 🔄 (/btw /recap /voice /teleport /desktop
  /background /batch /tasks /plan /login /logout /pr_comments /terminal-setup
  /privacy-settings /migrate-installer); skill-backed kept 🟡 (/review,
  /security-review, /schedule, /loop — skills confirmed under packages/core/skills).

CLI flags (apps/cli/src/parse-args.ts + cli.ts):
- split `--mode` / `--permission-mode`: the latter is parsed + validated but
  never consumed (cli.ts forwards only args.mode) → 🔄 not wired.
- add `-C` / `--cd <dir>` (✅, wired via process.chdir in cli.ts, PR #148).

Tools table (de-staled by PR #151) re-verified row-by-row — all markers hold:
TaskTool + ctx.runSubAgent (agent.ts), all 7 TASK_TOOLS, NotebookEdit,
AskUserQuestion, Enter/ExitPlanMode, Enter/ExitWorktree, ToolSearch, Cron*;
ScheduleWakeup correctly ⚠️ (not a tool — use CronCreate).

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

* docs(behavior-parity): fix /keybindings — it's a Claude Code built-in, not DeepCode-only

Verified against Claude Code's built-in command set: /keybindings ships in
Claude Code ("open or create your keybindings config file"). DeepCode's
/keybindings only lists bindings (read-only; edit ~/.deepcode/keybindings.json
by hand), so mark it ✓ / ✓ (read-only) / 🟡 — same shape as /config and
/permissions — rather than 🆕 DeepCode-only.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

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Co-authored-by: t <t@t>
Co-authored-by: Claude Opus 4.8 (1M context) <[email protected]>