docs(internal): v4.2 internal target skill mapping (draft, not a public release)

[Davincc77]

Summary

Adds internal-only documentation for the xklickd_internal_skill_v4_2 target mapping, ahead of internal production. Two new files under a new docs/internal/ directory:

• docs/internal/INTERNAL_SKILL_V4_2_MAPPING.md — the v4.2 internal target skill mapping.
• docs/internal/README.md — scope marker for the directory.

This is not a public release. It is non-normative planning material, comparable to docs/chimera/ but scoped to the internal track.

What the mapping captures (validated corrections)

• Governance symmetry — governance_system is documented in the same detail as memory_system (authority_hierarchy, human_veto, consent_rules, risk_levels, action_gates, non_lowerable_rules, escalation_rules, approval_lifecycle, revocation_rules, policy_conflict_resolution, governance_audit).
• supply_chain → skill_lifecycle — renamed conceptually; the doc explicitly does not claim supply-chain completeness.
• output_contract.graph_bindings — output contract wired to context_graph (creates_action_node, requires_policy_node, requires_evidence_node, may_trigger_veto_edge, writes_audit_edge).
• Naming harmonisation — domain_primary→primary_domain_competencies, domain_secondary→secondary_domain_competencies, domain_risk_model→domain_risk_profile, domain_output_contract→domain_output_requirements, plus competency_core.
• interactions layer + canonical flow — a new top-level layer documenting directed flows between layers, with the canonical end-to-end task flow.

Boundaries / non-claims

• Public .klickd stays v4.0.0 GA; the 42 x.klickd artefacts remain v4.1 candidates. No public v4.2 release is claimed.
• No tag, DOI, npm/PyPI latest, GitHub Release, schema, SDK, vector, or lock-file change.
• No examples/v4.1/x-klickd-skills/ artefact modified; no public README / CHANGELOG / Zenodo / CITATION change.
• Internal track name xklickd_internal_skill_v4_2 kept out of all public-facing surfaces (verified: name appears only under docs/internal/).
• Scoped to Davincc77/klickdskill only; no other repository referenced or touched.

Testing

• git diff --cached --name-status main → only the two new docs/internal/ files added.
• Forbidden-claim grep (released / GA / public v4.2 / tagged / DOI) → only disclaimer/negation sentences match; no actual claim.
• Internal-name leakage grep → name present only under docs/internal/.
• python3 scripts/validate_v4_1_candidate_mapping.py → PASS (42 artefacts validated).
• python3 scripts/validate_v4_schemas.py → all v4 strict-schema validations passed.
• Public version files unchanged: package.json, .zenodo.json, CITATION.cff all still 4.0.0; v4.1 artefact count unchanged (8 lite + 34 pro = 42).

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