chore(lint): register lint plugin in marketplace and document scope

Adds the lint plugin entry to both marketplace manifests and records
the resolved scope/structure decisions from grilling in CONTEXT.md:
standalone repo-agnostic plugin, split vale-config/vale-run skills,
report-only lint-runner agent, audit-pipeline wiring deferred.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01FxG5T8EJDgkABXxuneuFfn

.claude-plugin/marketplace.json

@@ -38,7 +38,12 @@
         "repo": "mattpocock/skills",
         "source": "github"
       }
+    },
+    {
+      "description": "Skills and agents for configuring and running linters, starting with Vale.",
+      "name": "lint",
+      "source": "./plugins/lint"
     }
   ],
-  "version": "0.2.0"
+  "version": "0.3.0"
 }

.github/plugin/marketplace.json

@@ -38,7 +38,12 @@
         "repo": "mattpocock/skills",
         "source": "github"
       }
+    },
+    {
+      "description": "Skills and agents for configuring and running linters, starting with Vale.",
+      "name": "lint",
+      "source": "./plugins/lint"
     }
   ],
-  "version": "0.2.0"
+  "version": "0.3.0"
 }

CONTEXT.md

@@ -66,5 +66,8 @@ A skill pair in the `core` plugin for writing, updating, and reviewing a target
 ### provider-adapter-author
 A companion skill (`core` plugin) that detects a target repo's provider-specific instruction file (`CLAUDE.md`, `.cursor/rules/*.mdc`, `copilot-instructions.md`, etc.) and, where it duplicates content AGENTS.md should own, converts it into a thin adapter that imports AGENTS.md — mirroring this repo's own ADR-0002/ADR-0003 two-tier adapter pattern. Self-validates via its own bundled deterministic script (`scripts/validate-adapter.sh`: checks for an import reference, no duplicated headings, size threshold) rather than a separate paired audit skill — the check is mechanical, so a script suffices per governance.md's "prefer deterministic code for repeatable tasks." `agentsmd-author` calls this skill via skill composition when it detects an existing provider file with overlapping content.
 
+### lint plugin
+A standalone, repo-agnostic plugin (`plugins/lint/`) for configuring and running linters — not scoped to kyberforge's own meta-tooling, and not (yet) wired into `skill-audit`/`agent-audit`. First linter is Vale (prose style linting), split into two skills per the git/gitea per-concern pattern: `vale-config` (setup — `.vale.ini`, `StylesPath`, styles) and `vale-run` (invoke Vale, interpret/report findings). A `lint-runner` agent composes these for isolated-context lint sweeps; it is report-only (no `Edit` tool) — it flags findings, it does not rewrite prose. Wiring Vale into the audit pipeline as a prefilter (the original motivation captured in branch `feat/84-vale-audit-prefilter`) is deferred to a follow-up task once this plugin exists standalone. Vale's research docs (`docs/research/docs/vale/`) moved from `plugins/kyberforge/` to `plugins/lint/` to keep the provenance chain same-plugin.
+
 ### LESSONS.md
 Long-loop feedback log for patterns observed across sessions. Three or more entries on the same pattern graduate to the relevant standing file (e.g. a coding convention, a governance rule). Updated by the session-handoff skill or directly by the human. Lives at the repo root.

plugins/lint/.mcp.json

@@ -0,0 +1,3 @@
+{
+  "mcpServers": {}
+}

plugins/lint/hooks.json

@@ -0,0 +1,3 @@
+{
+  "hooks": {}
+}