feat(temporal): add typed six-clock values and uncertain intervals

[seonghobae]

Scope

This Task 3 change adds TEPP's typed temporal foundation:

• distinct EventTime, AssertionTime, DocumentTime, SystemTime, AvailableTime, and KnowledgeCutoff nominal types;
• strict RFC 3339 parsing with explicit seconds and offsets, nanosecond precision, deterministic UTC normalization, and rejection of ambiguous or lossy forms;
• exact, bounded, open-ended, and explicitly unknown typed intervals;
• included, excluded, and unbounded boundaries;
• source precision from nanosecond through year plus unknown;
• fail-closed reversed, empty, semantically inconsistent, and unknown-precision intervals;
• strict versioned JSON clock and interval records with unknown-field, version, clock-type, malformed-boundary, and timestamp rejection;
• Draft 2020-12 JSON Schema output; and
• stable content-redacting temporal errors.

The implementation is Rust-only production logic and preserves nominal clock distinctions across parsing, ordering, interval validation, serialization, reconstruction, and schema generation.

Verification contract

This PR remains Draft until the current exact head satisfies:

• cargo fmt --check;
• warning-free workspace build, Clippy, tests, and rustdoc;
• production line coverage 100%;
• production branch coverage 100%;
• public rustdoc and repository contract checks;
• dependency, supply-chain, SAST, and security checks; and
• review of the exact head.

Claim boundary

This PR does not claim temporal reasoner closure, event ontology, database persistence, GPU kernels, topic estimation, ESEM/DSEM modeling, deployment, release, or commercial KPI evidence.

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[seonghobae]

@opencode-agent address

Keep this PR Draft and repair exact current head 5da25b764dfceccdab63f4cb0488913fc04b24c5 without weakening the quality gates. Run cargo fmt --all, inspect the permanent line and branch coverage reports, and add behavior tests for every uncovered temporal path until production line coverage is 100% and branch coverage is 100%. In particular exercise exact/bounded/unknown interval semantics, lower/upper included/excluded/unbounded combinations and contains short-circuits, invalid known/unknown precision, all-unbounded rejection, equal and unequal exact boundaries, malformed or mismatched clock/interval wire records, and strict RFC 3339 separator, digit, fraction, offset, leap-second, and terminal-shape failures. Do not add #[coverage(off)], ignore regions, generated-code exclusions, lowered thresholds, wrapper-only assertions, or transient repair files. Preserve the six nominal clocks, immutable evidence types, stable redacted errors, JSON Schema Draft 2020-12 contracts, Rust 1.97.1 baseline, full public rustdoc, CHANGELOG, and APA 7 doctoring. After the same head passes formatting, clippy, tests, rustdoc, deny, schema checks, 100% line/branch coverage, Security Scan, and Semgrep, update the PR description with only exact-current-head evidence and request independent review.

[seonghobae]

@opencode-agent address

Exact head 175f1bde3c6d2b46f2ec19a9a5bc4d9317ea993c is now green for formatting, compile, Clippy, tests, rustdoc, dependency policy, repository contracts, and 100% branch coverage; line coverage is the sole remaining failure at 1037/1038, attributed to one generic region in crates/temporal_core/src/wire.rs. Add a permanent all-six-clock wire contract—clock JSON round-trip, exact/bounded/open/unknown interval JSON round-trip, and clock-specific Draft 2020-12 schema assertions for EventTime, AssertionTime, DocumentTime, SystemTime, AvailableTime, and KnowledgeCutoff—so every generic wire instantiation is executed. Do not add exclusions or alter production semantics. Remove .github/workflows/repair-pr5-temporal-coverage.yml, rerun exact-head line and branch coverage, and keep Draft until both are 100% and every current-head security/review gate is green.