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doc: Add Debug Token Proposal (RFC #664)#665

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doc: Add Debug Token Proposal (RFC #664)#665
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chipsalliance:mainfrom
raghuncstate:rfc-debug-tokens-proposal

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Full proposal backing the Debug Tokens for Caliptra RFC.

This PR adds doc/DebugTokenProposal.md containing the detailed proposal referenced by RFC #664. No code changes; documentation only.

Scope:

  • Caliptra Subsystem (MCU) — primary scope. DSP0289 USAP over SPDM sessions, reusing the credential provisioning work in caliptra-mcu-sw PR #906.
  • Caliptra Core — optional, can be deferred. Per-boot mailbox command loop in FMC; Core remains DSP0289/SPDM-unaware.

Related issue: #664

Full proposal backing the Debug Tokens for Caliptra RFC.

Covers:
- Caliptra Core debug token architecture (FMC command loop, TLV format,
  mailbox commands) — optional, can be deferred
- Caliptra Subsystem (MCU) debug token architecture (DSP0289 USAP over
  SPDM sessions, CRED_BLOB credential provisioning) — primary scope
- Authorization model, token structures (TLV), mailbox commands (Core),
  MCTP VDM commands (Subsystem), error codes, requirements
- Potential simplifications and open items

Related: chipsalliance#664
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