feat: v0.6.0 — generic telemetry events, default filters, per-frame TUI updates

[Oceanswave]

Summary

Features

• Generic telemetry events — all 230+ telemetry fields now produce OpenClaw events via a generic fallback in the emitter; unmapped fields emit as snake_case event types (PackVoltage → pack_voltage) with field and value payload
• Default filter for unconfigured fields — DualGateFilter applies sensible defaults (any-change, 5s throttle, 2min staleness) to unconfigured fields instead of silently dropping them
• telemetry.get handler + MCP tool — agents can read the latest value of any telemetry field from the in-memory store
• Trigger commands in capabilities — NodeCapabilities advertises telemetry.get, trigger.list, trigger.create, trigger.delete
• TUI per-frame updates — panel DataTables update immediately as telemetry data arrives instead of polling on a 1-second timer
• Removed trigger.poll — trigger notifications are delivered exclusively via push callbacks over the OpenClaw WebSocket; the polling endpoint, MCP tool, and pending queue have been removed

Bugfixes & hardening

• Port-in-use crash — _resolve_port() pre-checks availability, auto-selects a free port when the default is occupied, raises clear UsageError for explicit --port; environment-sourced ports treated as explicit
• SystemExit killing the event loop — uvicorn's sys.exit(1) caught by _safe_uvicorn_serve() and converted to OSError; clean shutdown (code 0) logged at debug
• Notification serialization hardening — guards narrowed from except Exception to (AttributeError, TypeError, ValueError); per-notification isolation in both push callback and flush loop
• Pending push queue overflow — logs dropped notification before eviction; flush_pending_push guarded after reconnect
• system.run unknown method — bumped to warning with both raw and resolved method names
• contextlib.suppress hiding bugs — replaced with explicit try/except + debug-level logging
• p.pop("field") mutating MCP params — fixed with p.get() + filtered dict copy
• _matches() → matches() — renamed to public API for cross-module consumers
• Shared _internal/units.py — replaces 3 duplicate temperature conversion implementations
• telemetry_get store-unavailable — returns {"error": "telemetry_store_unavailable"} instead of misleading {"pending": true}
• Empty exception message crash — shows "Unexpected {Type}" + --verbose hint
• Reconnect/Tailscale warnings — added exc_info=True for traceability

Test plan

• All 1749 tests pass (pytest --timeout=30)
• Ruff lint clean (ruff check src/ tests/)
• New tests/cli/test_serve_port.py — port resolution, conflict handling, SystemExit wrapping (8 tests)
• Manual: run tescmd serve and confirm TUI panels populate immediately on first telemetry frame
• Manual: confirm unconfigured telemetry fields appear as events in OpenClaw gateway logs
• Manual: start tescmd serve when port 8080 is occupied — verify auto-select and log message

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