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feat: close harness audit gaps — endpoint crash probe, elf-archive metadata, python floor (TA-469/461/450) (#588)

* feat: spec-driven endpoint crash probe (TA-469)

- add `fleet probe-endpoints <--hosts>` subcommand
- enumerates GET paths from device's /api/openapi.json via fleetlib/spec.py
- reads baseline uptime from /api/info, re-reads between each hit
- flags and names any endpoint after which uptime regresses (crash/reboot)
- skips streaming (/api/logs, /api/diag/events, /ws) and mutating methods by default
- opt-in flags: --include-streaming, --include-mutating
- prints per-endpoint table (endpoint | status | ok/crash)
- 7 offline unit tests (mock client): GET-only enumeration, uptime regression
  detection, streaming/mutating skip/include, unreachable device, no-crash path
- live probe on 172.16.1.81 (esp32-wroom32): 24 endpoints, no crashes

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

* fix: populate elf-archive metadata from esp_app_desc; verify IN-USE (TA-461)

- add parse_esp_app_desc() to elfstore.py: searches ELF bytes for magic
  0xABCD5432, parses esp_app_desc_t (version, project_name, build_time,
  build_date) at the documented offsets; returns None when magic absent
- archive() now auto-populates board (project_name) and version from
  esp_app_desc_t when caller does not supply them; caller args take precedence
- cmd_elf_archive shows final sidecar values + annotation when fields came
  from esp_app_desc_t rather than CLI args
- 12 offline unit tests: struct parsing, null-stripping, truncated-struct
  guard, no-magic fallback, auto-populate precedence rules, CLI annotation
- IN-USE verified live:
  - device .81 running app_sha256=11321471c (build.app_sha256 from /api/info)
  - archived /TaipanMiner/.pio/build/esp32-wroom32/firmware.elf -> sha256
    11321471cfe45e2b... (prefix matches); fleet elf list shows IN-USE=yes
  - board auto-populated as 'taipanminer-esp32-wroom32'; version as
    'dev-main-bb-7043c1e' (matches /... (continued)

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