docs(msp): add MSP_TechFullSpec.md

[Freshair129]

Summary

• Adds MSP_TechFullSpec.md at repo root — a single-page technical reference for the MSP (Memory & Soul Passport) gatekeeper.
• Extracts content from FRAMEWORK_MASTER_SPEC.md §7, scripts/msp/*.mjs, and .brain/msp/LLM_Contract/*.yaml so newcomers don't have to assemble it themselves.
• Covers: why MSP, architecture/layers, inbound flow + submission envelope, atomic write contract (required/forbidden/anti-hallucination), codegen micro-task contract, phase governance (L1–L3, devlog IDs), memory subsystem (sessions JSONL + episodic memory), promotion/rollback, human review gates, escape hatches (HOTFIX, legacy), tooling commands, project path encoding, authority matrix, failure-mode diagnostics, and known TODOs.

Test plan

• Boss reads §0 TL;DR + §13 Authority Matrix — confirms accuracy
• Cross-check §4 (atomic contract) against .brain/msp/LLM_Contract/phase2_atomic_contract.yaml
• Cross-check §5 (codegen contract) against .brain/msp/LLM_Contract/codegen_microtask_contract.yaml
• Cross-check §6 (phase governance) against FRAMEWORK_MASTER_SPEC.md §7.7
• Decide on §15 open issues (especially path encoding D--evaAI vs evaAI)

Note: This is a high-level navigator/reference doc — per Lean Navigator law (§9.3), detailed specs still live in their canonical sources; this file links out, not inlines.

https://claude.ai/code/session_01Kfp2cxCv7PoJNTVqVdQnYd

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