Fix what the pre-release audit found, in code and docs

[nickschuetz]

What

The required pre-release audit checked every doc and docstring against the code for 0.6.0. Where the code was wrong, not just described wrong, this fixes the code.

Code

• set_component_property printed "Set ..." without checking the result, and get_component_property reported a failed read as {"value": "None"}. Both now check the outcome (set_property_failed, get_property_failed) and report an unknown component or one not on the entity.
• add_component reported "Added" when the add raised or returned no outcome.
• get_cvar had two false values:
  • it answered an unknown CVAR with the engine's text "(missing)" as its value (found in the live check for this PR), now cvar_not_found;
  • it answered a failed read with "Error: ...", now get_cvar_failed.
• get_viewport_camera returned a bare error key; it now returns viewport_camera_unavailable.
• get_bus_schema_live answered a bus missing from a real module as a live result with an error key; it now falls back to the stubs and reports bus_not_found.
• Three fallbacks addressed Broadcast-only events with bus.Event and could never work; removed.
• instantiate_prefab rebuilt parent_id with entity.EntityId(n), which is invalid on 26.10.0, so the parent was silently ignored. It now looks the parent up; an unknown one is entity_not_found.
• With O3DE_EDITOR_TLS_VERIFY=1 and no O3DE_EDITOR_TLS_CA, no CA was trusted and every handshake failed. The system CA store is now loaded, as the docs say.

Docs and docstrings

• Docstrings now say what the code does for set_transform (the 0.6.0 native scale and quaternion), get_entity, list_sequences, the animation module, capture_viewport, capture_renderdoc_frame and the project listers.
• The tool reference fixes the viewport camera (Euler rotation, no FOV), capture_viewport (Atom capture; width and height ignored on 26.10.0), save_prefab (always prefab_save_unavailable), list_sequences, the readiness tools in the asset section, the component and asset examples, and the fast-fail wording.
• AGENTS.md maps its seven tool groups onto get_capabilities' groups.
• Recipes, the examples and the skill:
  • no longer rebuild entity ids from text; they use the tools, or a SearchBus lookup;
  • use the current tool counts and gem versions (gem 0.6.0, API 0.5.0);
  • show PhysX trigger and shape property paths that were checked live.
• CONTRIBUTING.md lists the conventions new tools follow.

Tests

• Surface: each new envelope path and the prefab parent.
• Unit: the TLS context with and without a CA file.
• Live, against AiCompanion gem 0.6.0 (API 0.5.0):
  • full suite 58 of 58, including new tests for the unknown CVAR and a collider property round trip with its refusals;
  • direct probes of every changed path.