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feat: fleet watch — per-endpoint observer with until/alert (#575)

* feat: safe field-expression evaluator (fleetlib.expr)

- ast-based parser with strict node allowlist (no eval/exec)
- supports field.path OP literal comparisons (int, float, str, bool, null)
- and/or/not/parens; missing field evaluates to false
- rejects call nodes, dunders, and arbitrary code (injection-safe)
- unit tests: comparisons, bool ops, missing field, malformed, injection rejection

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* feat: fleet watch (per-endpoint observer with until/alert)

- cmd_watch: generic per-endpoint poll loop; GET-only, read-safe
- --fields, --interval, --count, --duration (30s/5m/1h/bare secs)
- --on-change: emit row only on field value change
- --until EXPR: exit 0 on condition; exit 1 on timeout (scriptable wait)
- --any: condition met when any device satisfies (default: all)
- --alert EXPR: flag rows when condition true, non-terminating
- --out-csv / --out-json: write time series to file
- spec-aware warning when path not in served spec (suggests ./fleet describe)
- clean KeyboardInterrupt handling (no traceback)
- unit tests: field rows, on-change, count, until exit codes, any/all, alert, csv/json
- README: watch subcommand section with flag docs and examples

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

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