docs: reconcile docs drift across CHANGELOG, API, CLI, MCP, and Journal (#290)

[sshekhar563]

Resolves #290.

This PR reconciles accumulated documentation drift across 5 core documentation files following recent feature merges:

1. CHANGELOG.md

• Added missing [Unreleased] entries for 6 merged PRs:
  • #255/#256: decision.outcome_attached journal action
  • #258: decision.completed + build_policy_event + build_completion_event for RFC 09
  • #264: Store episodic remember/note content verbatim (⚠️ user-visible behavior change)
  • #272: MemoryProvenance enum (HUMAN, AGENT) + Soul.curate_agent_procedures()
  • #228/#271: Cross-runtime test suite for PocketPaw, LangChain, and CrewAI

2. docs/api-reference.md

• Documented provenance: MemoryProvenance = MemoryProvenance.HUMAN kwarg on Soul.remember()
• Added documentation for Soul.curate_agent_procedures(similarity_threshold=0.6)
• Documented MemoryProvenance enum (HUMAN, AGENT)

3. docs/org-journal-spec.md

• Updated the Decisions action namespace list to include decision.completed and decision.outcome_attached alongside decision.graduated

4. docs/mcp-server.md

• Corrected total MCP tool count from 28 → 39 in header and summary breakdown
• Added documentation sections for previously undocumented MCP tools: soul_health, soul_cleanup, and soul_edit_core

5. docs/cli-reference.md

• Added missing soul unpack command documentation section
• Added missing soul delete command documentation section
• Corrected soul recall --limit option flag from -l to -n
• Fixed broken soul archive example syntax (--tiers ipfs --tiers arweave)