feat(experimental): export Focus–Field recovery operator result

[safal207]

Summary

Adds a minimal portable serializer for CML Focus–Field Recovery v0.2 so downstream Graph–Field consumers can consume a stable result shape without importing CML internals or duplicating CML trust gates.

Why

RESONANCE Graph–Field Operator Family now treats existing CML Focus–Field as its RecoveryOperator. The missing seam was a source-owned serialization contract.

This PR closes only that seam. It does not change the recovery scorer, weights, applicability logic, information-quality logic, or authority semantics.

Export contract

cml.experimental.focus_field_export.export_recovery_decision(...) emits:

source_contract = cml.focus-field.recovery-decision.v0.2
source_revision = <full Git SHA>
state
selected_anchor_id
score
rewind_steps_saved
trusted_continuation
ranked_candidates
mode = ADVISORY_ONLY
authority_granted = false

The exporter preserves reanchored_exploratory and trusted_continuation=false without promoting historical context into current trusted continuation.

Boundary

• no RESONANCE import;
• no downstream consumer import;
• no new scorer;
• no authority grant;
• no execution/merge/deployment/payment/security effect;
• current CML applicability and information-quality gates remain canonical.

A downstream consumer may normalize this data into its own advisory envelope, but must not reinterpret trusted_continuation as execution authority.

Validation

Adds focused tests for:

• portable trusted result export;
• exploratory-state preservation;
• explicit ADVISORY_ONLY / authority_granted=false boundary;
• full-hex source revision validation.

[github-actions]

Relevant CML Memory

Deterministic retrieval for PR #286 at head d05b35d090ad against accepted memory on base 90c7fdaaf31a.

No publishable accepted memory matched this change

No publishable accepted memory met the relevance threshold.

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Publishable candidates evaluated: 0 · selected: 0.
Public-repository policy surfaces only packs with visibility=public and contains_private_data=false.

CML memory is advisory: verify that the recorded constraints still apply. This comment grants no approval, execution, or merge authority.

[coderabbitai]

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