Make the repo read as a hand-authored reference project by dropping
references to the authoring tooling — the internal convention "skills", the
Linear backlog, and the REDI issue ids — from the README and source comments.
- README: remove the "Convention skills index" section and its TOC entry,
strip every `See **android-...**` / koin-constructor-dsl citation, drop the
Linear backlog link, and reword the REDI-99 Room reference to "an optional
stretch".
- Source comments: neutralize the four skill citations in HttpClientExt,
CharactersPresentationModule, CharacterListRobot, ErrorDemoViewModel.
- Also correct the testing section that the MockK migration left stale: it
described "Fakes, not mocks" / FakeCharacterRepository (now deleted) — now
describes MockK, and adds MockK to the stack lists.
Verified: git grep finds no AI/Claude/Anthropic/Linear/skill references in any
tracked file; assembleDebug + assembleDebugAndroidTest green.