Close Equatorium RRULE and transport release gaps

[tetracoralla]

Summary

• ship the existing RRULE and typed MCP output work together with public release hygiene
• bind both live MCP input and output schemas in the Capability provider manifest and add an executable transport probe
• complete RRULE plugin discovery and deterministic Chinese UI meanings/errors

Verification

• npm run check (13 files, 154 tests plus schemas, safety, release, build, Capability, Agent, and fresh-package checks)
• central Capability canonical and live transport binding conformance: PASS
• 1,000 generated RRULE idempotence/meaning cases plus 29 explicit boundary cases: PASS
• real browser at 320/390/1280 widths, ambiguity, correction, copy, reload: PASS
• bounded worker overload, timeout, invalid-storm and recovery audit: PASS
• npm pack --dry-run with isolated cache: PASS

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