docs: approve filtered-word escaping as enumerated output facts

[e54-bot]

Refs #374 (records the decision; the implementation stays open under #374).

Decision

opy-rs reproduces the pinned OverPy 9.7.10 filtered-word escaping (soft hyphen inserted into about 30 words, invisible formatting characters removed) for rule names and the main.modeName / main.description settings strings, so this output converges structurally with the reference as goal principle 7 requires. Approved by the project owner in the #374 discussion.

Changes

• docs/adr/0007-filtered-word-escaping.md: the decision, including why the client's censor list (option C) cannot be the source and why keeping only rigger/admin (option B) is rejected.
• docs/compatibility/source-policy.md: new Enumerated output facts section. It admits a fact set that cannot be found by probing only when its content is fixed by the pinned output, an owner decision names it, the core holds an opy-rs-owned attributed representation, every entry is oracle-pinned (with a negative case for each whole-word match), and it changes only with a pin change. Only this word set is approved; it is no precedent for other upstream tables.
• docs/adr/README.md: index entry.

Not in this PR

The implementation, its fixtures and the docs/language-support/tooling-and-backend.md status update, tracked in #374.

Verification

Docs only. git diff --check clean; relative links and the language-core.md#compatibility-target anchor checked. The settings scope was confirmed against the pinned oracle: modeName: "Poland account" is written as P\u00adoland a\u00adccount, and native currently writes it unchanged.