feat(operations): define result 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	Parameter schemas and surface projections (#265)
7	feat/operations-result-schemas	surface branch	Closed canonical result payload schemas

Summary

• generate 59 closed Draft 2020-12 result payload schemas
• bind each result schema ID directly to its canonical OperationSpec
• normalize mixed donor outputs into 13 shared result families
• bound inventory, status, metrics, mutation, text/artifact, command, fanout, transfer, diff, file-content, help, and diagnostic-report payloads
• require inline text/command output or protected artifact references without ambiguous duplication
• preserve product-specific legacy JSON as projectors above the canonical payloads
• add a machine schema for the generated bundle
• add a digest-bound Rust test proving complete operation coverage, closed top-level payloads, unique schema IDs, and family coverage
• add Just recipes and documentation-package integration

Digest

• result schemas: 7addf92410b53205dc7ae2b9b80bb58a4ccfbe947e206bb93a8bb439366c3e3a

Validation

• generator check: 59 result schemas
• all 59 schemas pass Draft 2020-12 meta-validation
• bundle schema validates the checked-in instance
• behavioral probes passed for command/text artifact exclusivity, fanout, transfer, diff, mutation, and unknown-field rejection
• cargo fmt --all --check
• 55 unit tests passed
• five 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: 133 files
• git diff --check

Scope boundary

This PR defines canonical result payload schemas. Synapse compatibility projectors and concrete shared execution adapters remain the next implementation slices.