docs: add ADR-0014 and provenance chain glossary entries

Record the decision to add INFO as a third skill-audit finding level
(observational, non-actionable, does not affect pass/fail). Add
Provenance chain and INFO (finding level) to CONTEXT.md glossary.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docs/adr/0014-skill-audit-info-finding-level.md

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+# Add INFO as a third finding level in skill-audit reports
+
+`skill-audit` shipped with two finding levels: FAIL (blocks shipping) and
+SUGGESTION (optional improvement). Provenance validation introduced observations
+that are worth surfacing but not actionable: a `references/*.md` file with no
+`source_keys` when `sources.md` is present, and a skill-level source slug absent
+from upstream research docs. Folding these into SUGGESTION would imply they
+should be fixed — but retroactive source backfill after a reference file is
+written is unreliable and not expected practice. A third level, INFO, is therefore
+introduced: observational, no action implied, never changes the pass/fail verdict.
+Counted separately in the result block as `· P info`.
+
+## Considered options
+
+**SUGGESTION with softer language (rejected)** — describe the finding as "worth
+noting" rather than "should be fixed." Rejected because SUGGESTION already carries
+an established meaning in the report; softening the language creates ambiguity
+without changing the semantic level. Downstream consumers (humans, skill-improve)
+would need to infer intent from prose rather than a stable token.
+
+**Suppress entirely (rejected)** — omit findings that have no fix. Rejected
+because the observations are useful for a human reviewing provenance completeness.
+Silent omission loses information without reducing noise.
+
+## Consequences
+
+- Report format gains a third token: FAIL, SUGGESTION, INFO. INFO findings do not
+  affect pass/fail; counted as `· P info` in the result block.
+- `skill-improve` currently ignores anything below FAIL — that behavior remains
+  correct; INFO findings are not forwarded to it.
+- Future soft observations should use INFO rather than SUGGESTION when no fix is
+  actionable.