feat!: remove legacy --ai, --ai-commands-dir, and --ai-skills flags (0.10.0) (#2872)

* Initial plan

* feat!: remove legacy --ai, --ai-commands-dir, and --ai-skills flags at 0.10.0

* refactor(tests): rename stale test_ai_help_* methods to test_agent_config_*

* fix: address review — derive agent folder for generic integration and remove redundant test

- Security notice now falls back to integration_parsed_options['commands_dir']
  when AGENT_CONFIG folder is None (generic integration).
- Remove test_agent_config_includes_kiro_cli which duplicates the assertion
  in test_runtime_config_uses_kiro_cli_and_removes_q.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* docs: scrub all remaining --ai flag references from source and tests

- Remove dead AI_ASSISTANT_ALIASES, AI_ASSISTANT_HELP, and
  _build_ai_assistant_help() from _agent_config.py
- Update comments/docstrings in extensions.py, presets.py, and
  integration subpackages to reference 'skills mode' or
  '--integration' instead of the removed flags
- Fix catalog.json generic integration description
- Update test docstrings/comments in test_extension_skills.py,
  test_extensions.py, and test_presets.py

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* test: remove legacy --ai flag rejection tests

The flags are fully removed from the CLI; typer handles unknown options
generically. No custom rejection logic exists to test.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* revert: remove manual CHANGELOG.md entry

CHANGELOG is generated automatically; manual edits should not be made.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* fix: make generic catalog description self-explanatory

Include the required --commands-dir sub-option in the description so
readers don't need to look up integration docs.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* fix(tests): rename duplicate test classes to avoid shadowing

The rename from Test*AutoPromote to Test*Integration collided with the
existing Test*Integration(SkillsIntegrationTests) base classes, causing
the shared test suites to be silently overwritten. Rename the CLI init
flow classes to Test*InitFlow instead.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: Manfred Riem <mnriem@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/specify_cli/presets.py

@@ -1219,7 +1219,7 @@ class PresetManager:
         directory.  If so, the skill is overwritten with content derived
         from the preset's command file.  This ensures that presets that
         override commands also propagate to the agentskills.io skill
-        layer when ``--ai-skills`` was used during project initialisation.
+        layer when skills mode was used during project initialisation.
 
         Args:
             manifest: Preset manifest.
@@ -1559,7 +1559,7 @@ class PresetManager:
                 "registered_commands": registered_commands,
             })
 
-            # Update corresponding skills when --ai-skills was previously used
+            # Update corresponding skills when skills mode was previously used
             # and persist that result as well.
             registered_skills = self._register_skills(manifest, dest_dir)
             self.registry.update(manifest.id, {