feat(agents): make skill metadata agent-agnostic

.agents/adr/0001-consume-writes-target-push-channel.md

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+# Consume writes the target's push channel, not only the vault
+
+`consume` was scoped to write only inside the vault's `01 sources/claude/` area.
+A real run showed that most mined knowledge is not wiki-shaped — specific residue and proactive rules belong in the target's own always-loaded `AGENTS.md` — and dropping it lost real signal, while redoing the target-doc edits by hand after each run was toil.
+We decided `consume` writes a second channel outside the vault, the target's `AGENTS.md`, rather than only planning those edits for the user to apply.
+
+## Considered Options
+
+- **Plan-only** — spell the target-doc edits out in the report and have the user apply them by hand.
+  Rejected: the whole value is not redoing what the run already worked out.
+- **Auto-write both channels (chosen)** — apply the target edits too, but present them as a distinct, independently-approvable write-set under the one plan-approval gate, so a write outside the vault is never a surprise.
+
+## Consequences
+
+`consume`'s blast radius now includes files outside the vault and outside the spec/task scaffolding it deletes.
+The plan-approval gate is what keeps that safe: the target write-set is approved separately from the vault write-set, and a declined target write-set degrades to flagged suggestions.
+Destructive edits to `AGENTS.md` are gated on capture — an entry is removed or trimmed only when its general part is present in the wiki.