feat(operations): define surface contracts

[jmagar]

Stack

Position	Branch	Base	Purpose
1	feat/product-family-architecture	main	Product-family architecture (#257)
2	feat/operations-foundation	architecture branch	Neutral operation foundation (#260)
3	feat/operations-semantic-parity	foundation branch	Donor legacy semantics (#261)
4	feat/operations-canonical-classification	semantic branch	Canonical classifications (#262)
5	feat/operations-schema-diagnostics	classification branch	Schema IDs and diagnostic vocabulary (#264)
6	feat/operations-surface-contracts	schema branch	Closed parameter schemas and surface projections

Summary

• generate 59 closed Draft 2020-12 canonical parameter schemas
• exclude Flux/Scout routing and presentation fields from shared schemas
• preserve exact required and alternative parameter groups from the pinned donor
• encode bounded fields, defaults, enum constraints, delta exclusivity, Compose volume-removal confirmation, and command allowlisting
• generate complete projections for all 33 stable diagnostic codes across CLI exit codes, HTTP statuses, MCP error codes, event severity, retry, and terminal behavior
• add machine schemas for both generated bundles
• add digest-bound Rust tests proving schema IDs, closed shapes, required parity, complete operation coverage, and exact diagnostic vocabulary coverage
• add Just recipes and documentation-package integration

Digests

• parameter schemas: 62ff07d6fed6bf18d65fae54708c28ceb3397a4c4cf9f9810a6ef61a68f308fa
• diagnostic projections: 87d9be437bf7a0ac8a21ac32e03e852a98d6ba30591c2ad6009e570cd35fafaa

Validation

• generator check: 59 schemas, 33 diagnostic projections
• every parameter schema passes Draft 2020-12 meta-validation
• both bundle schemas validate their checked-in instances
• behavioral probes pass for delta alternatives, Compose force confirmation, unknown-field rejection, and command allowlisting
• cargo fmt --all --check
• 55 unit tests passed
• four operation integration tests passed
• strict all-feature Clippy passed
• rustdoc with warnings denied passed
• unrelated external consumer compile passed
• architecture check passed: 37 packages, 85 internal edges
• full xtask suite passed: 206 tests
• docs manifest/checksums current: 131 files
• git diff --check

Scope boundary

This PR defines canonical parameter schemas and diagnostic surface projections. Concrete typed result payload schemas and product adapter implementation remain the next slices.