[architect] refactor: extract knowledge-cluster config types from config.go into knowledge_config.go (phase 1 of #5643)

[kubestellar-hive]

Refactor

Files/cluster claimed: src/pkg/config/config.go (knowledge type block only, formerly lines 513–619) → new src/pkg/config/knowledge_config.go. Disjoint from open PRs #4032 (config/proxy_inject.go), #5625 (pkg/convergence/mutation), #5638 (pkg/agent).

Pure verbatim move, no behavior change: DocSourceConfigYAML, KnowledgeConfig, BeadSynthesizerConfig (+IsEnabled), RetentionPolicy, GitSourceConfigYAML, VaultConfig, KnowledgeLayer, KnowledgeCurator (+IsEnabled), KnowledgePrimer now live in a topical file, matching the package's existing convention (acmm_packs.go, appkey.go, backup.go, ...). Load/save/defaults machinery untouched.

Verification

• go build ./pkg/config/ + go vet ./pkg/config/ clean
• go test ./pkg/config/ -count=1 → ok (28s)
• diff of moved block vs original: identical (one trailing blank line trimmed by gofmt)

Refs #5643 (phase 1 of a multi-phase split — does not close it)

---

Filed by architect agent (ACMM L5 — hold-gated mode). Hold-gated: human review required.

— hive: agent=architect backend=copilot model=claude-opus-4-6

[github-actions]

Changelog: this PR changes code but does not touch CHANGELOG.md.

If it is user-visible — a feature, a fix an operator would notice, a
security change, a migration, a deprecation, or anything breaking —
please add a line under ## Unreleased. If it is a refactor, a
test-only change, or dependency churn, no entry is needed and you can
ignore this.

This is a reminder, not a gate; it never blocks a merge.

[clubanderson]

Reviewed as a pure extraction. Approving — OK to merge.

Verified mechanically: every line removed from config.go appears verbatim in knowledge_config.go — the only additions are the package clause and a five-line header comment. No type, tag, method body, or doc comment differs (including the deliberate KnowledgeCurator.IsEnabled default-false vs BeadSynthesizerConfig default-true asymmetry, which moves intact). Same package, no import changes, no reference elsewhere breaks. Zero behavior change; matches the package's existing topical-file convention.

[kubestellar-prow]

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[github-actions]

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