docs: fix 30+ inaccuracies across documentation (#9023)

Cross-referenced all docs pages against the actual codebase and fixed:

Reference docs (cli-commands.md, slash-commands.md, profile-commands.md):
- Fix: hermes web -> hermes dashboard (correct subparser name)
- Fix: Wrong provider list (removed deepseek, ai-gateway, opencode-zen,
  opencode-go, alibaba; added gemini)
- Fix: Missing tts in hermes setup section choices
- Add: Missing --image flag for hermes chat
- Add: Missing --component flag for hermes logs
- Add: Missing CLI commands: debug, backup, import
- Fix: /status incorrectly marked as messaging-only (available everywhere)
- Fix: /statusbar moved from Session to Configuration category
- Add: Missing slash commands: /fast, /snapshot, /image, /debug
- Add: Missing /restart from messaging commands table
- Fix: /compress description to match COMMAND_REGISTRY
- Add: --no-alias flag to profile create docs

Configuration docs (configuration.md, environment-variables.md):
- Fix: Vision timeout default 30s -> 120s
- Fix: TTS providers missing minimax and mistral
- Fix: STT providers missing mistral
- Fix: TTS openai base_url shown with wrong default
- Fix: Compression config showing stale summary_model/provider/base_url
  keys (migrated out in config v17) -> target_ratio/protect_last_n

Getting-started docs:
- Fix: Redundant faster-whisper install (already in voice extra)
- Fix: Messaging extra description missing Slack

Developer guide:
- Fix: architecture.md tool count 48 -> 47, toolset count 40 -> 19
- Fix: run_agent.py line count 9,200 -> 10,700
- Fix: cli.py line count 8,500 -> 10,000
- Fix: main.py line count 5,500 -> 6,000
- Fix: gateway/run.py line count 7,500 -> 9,000
- Fix: Browser tools count 11 -> 10
- Fix: Platform adapter count 15 -> 18 (add wecom_callback, api_server)
- Fix: agent-loop.md wrong budget sharing (not shared, independent)
- Fix: agent-loop.md non-existent _get_budget_warning() reference
- Fix: context-compression-and-caching.md non-existent function name
- Fix: toolsets-reference.md safe toolset includes mixture_of_agents (it doesn't)
- Fix: toolsets-reference.md hermes-cli tool count 38 -> 36

Guides:
- Fix: automate-with-cron.md claims daily at 9am is valid (it's not)
- Fix: delegation-patterns.md Max 3 presented as hard cap (configurable)
- Fix: sessions.md group thread key format (shared by default, not per-user)
- Fix: cron-internals.md job ID format and JSON structure

website/docs/guides/automate-with-cron.md

@@ -254,7 +254,7 @@ The `--deliver` flag controls where results go:
 
 **Test with `/cron run`.** Before waiting for the schedule to trigger, use `/cron run <job_id>` to execute immediately and verify the output looks right.
 
-**Schedule expressions.** Human-readable formats like `every 2h`, `30m`, and `daily at 9am` all work alongside standard cron expressions like `0 9 * * *`.
+**Schedule expressions.** Supported formats: relative delays (`30m`), intervals (`every 2h`), standard cron expressions (`0 9 * * *`), and ISO timestamps (`2025-06-15T09:00:00`). Natural language like `daily at 9am` is not supported — use `0 9 * * *` instead.
 
 ---
 

website/docs/guides/delegation-patterns.md

@@ -216,7 +216,7 @@ Restricting toolsets keeps the subagent focused and prevents accidental side eff
 
 ## Constraints
 
-- **Max 3 parallel tasks** — batches are capped at 3 concurrent subagents
+- **Default 3 parallel tasks** — batches default to 3 concurrent subagents (configurable via `delegation.max_concurrent_children` in config.yaml)
 - **No nesting** — subagents cannot call `delegate_task`, `clarify`, `memory`, `send_message`, or `execute_code`
 - **Separate terminals** — each subagent gets its own terminal session with separate working directory and state
 - **No conversation history** — subagents see only what you put in `goal` and `context`