release: prepare v1.0.0 spec/version baseline

[hiroshitanaka-creator]

Motivation

• Prepare repository baseline for the v1.0.0 release by making a canonical package version, SRS snapshot, changelog entry, and a stable release-check entrypoint available in-tree.
• Provide a reproducible entrypoint for automated release gating that can be invoked by CI while keeping external CI status injection explicit and auditable.

Description

• Bumped package version to 1.0.0 in pyproject.toml to mark the v1.0.0 baseline.
• Added a frozen SRS snapshot docs/spec/srs_v1.0.md and updated docs/spec/srs_v0.1.md header metadata to reflect the v1 baseline.
• Added scripts/release/check_v1_release.py as a compatibility entrypoint that invokes the existing release readiness checker, and updated CHANGELOG.md with a [1.0.0] entry describing the change set.
• Updated tests/test_release_readiness.py to validate the package version 1.0.0 as part of automated release-readiness checks.

Testing

• Ran the release checker python scripts/release/check_v1_release.py which reports failure when --ci-status-file is not supplied (expected because CI status is an external input), and passes when invoked with a synthetic CI status JSON (--ci-status-file /tmp/ci_status.json).
• Ran pytest -q tests/test_release_readiness.py which passed after updating the expected version to 1.0.0.
• Ran pytest -q -m "not benchmark" (all non-benchmark tests) which completed: 3511 passed, 134 skipped, 15 deselected.
• Ran the full pytest -q which showed a single benchmark regression in tests/benchmarks/test_pipeline_perf.py::test_bench_deliberation_scaling (deliberation scaling threshold exceeded) that is unrelated to the version/spec material changes and should be addressed separately; other functional tests passed.

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