[stefan-jansen]

Refs #56. Close the compatibility wait only after fresh merged-main qualification passes on every supported platform.

Add final Python 3.15 to the complete installed-wheel matrix alongside 3.12-3.14 on Linux, macOS and Windows. Retain immutable build-once artifacts, actual installed import/byte verification, full suites, types, coverage, security and executable/strict documentation. Remove the obsolete shared dependency-wait exception. The monthly unlocked-dependency canary remains unchanged.

Current head: d752adbd2e953ad2411b23372fe828a7002ba3f8. It includes actual temporal main b0d202771151c1eb3e8e89f0917452ac4878c17c, published Specs >=0.2,<0.3, and the merged CI101 workflow. Each of the twelve supported cells runs one complete suite; separate fresh-process MACD, public-order and cold-call stress retains its configured repetitions. The shared workflow's additional 3.15 rc1 probe does not substitute for final 3.15.0 qualification.

Repairs and compatibility

• TA-Lib 0.7.1 failed to build on final 3.15 without native headers. Require >=0.8.2,<0.9, which supplies supported native wheels. Update the observed source-build reference dependencies to SciPy 1.18.1 and contourpy 1.4.0. Keep TA/store/viz coverage on all platforms.
• The previous Windows job spent 40 minutes installing dependencies, including DuckDB 1.5.6 compilation, then hit its 45-minute limit during tests. Budget 90 minutes for 3.15 full-wheel and native jobs; retain existing budgets elsewhere. Do not omit tests or change child-process timeouts.
• Preserve Engineer APO/PPO's SMA default by explicitly matching TA-Lib's moving-average parameter. TA-Lib 0.8 defaults to EMA. For the seeded crypto-price regression producer, an independent 50-digit Decimal calculation measured slope errors of 5.9e-12 for Engineer versus 2.9e-9 for the drifting TA reference. Use translated least squares for this comparison, preserving rtol=1e-7 and checking NaN/warmup masks. No runtime numerical definition changed.
• Distinguish development 0.2 examples from published 0.1.6. The new calendar argument fails against the published package; its preserved tagged quick start passes and is linked. Correct the source installation's clone-directory step. Actual clone-to-core-install-to-README execution passes on Python 3.14 with 17 runtime packages. Correct the copied bug-form project description without changing intake policy or fields.

Executed evidence

At frozen integration ecce4c5618c3aa008f8f3532fd60853b795c216d:

• 206 focused cases pass in 42.55s.
• Complete source suites each pass 4,695 tests, normal in 189.55s and canonical coverage mode in 181.22s. All critical thresholds pass, with 95.91% line and 89.99% branch coverage.
• The normally installed exact wheel on final CPython 3.15.0 passes all 4,695 tests in 123.84s, dependency consistency, immutable package identity and executable documentation. An earlier outside-checkout invocation had seven artifact-fixture CWD setup errors; the corrected complete run executes those seven tests successfully, with nothing skipped.

The final d752adb follow-up changes only the native job budget. All 200 package files are independently byte-identical to that fully tested wheel. Its fresh installed 3.15 run passes 368 public consumers, 200 Engineer/nine published Specs file identities, and dependency consistency. Actionlint, Ruff/format/ty/hooks, lock, executable docs, strict MkDocs and package/Twine checks pass.

Final local artifact tree: 3cf03d044d547a48606a82140757bd24c1f00c62.

• Wheel SHA256: f7c0c083a9d4c6cb7556c48854b1981eb62023c50309c850413d62c4be573270.
• Sdist SHA256: eb51defc05cb169f04307dcd0f76b7b19b4db40195182b6a7d777eeaac0614cf.

All 49 candidate contexts completed, with 48 successes and one inapplicable exception skip. Every installed-wheel cell passes all 4,695 tests, installed-origin/byte checks, types and executable docs, including actual final CPython 3.15.0 on all three systems. All shared source and native stress cells pass. Windows 3.15 full-suite job 117568707870 passed in 322.31s; native job 117568139621 passed the full configured stress protocol. Final package job 117576041937 succeeded at 03:30:23 UTC.

Ordinary exact-head-guarded merge completed at 2026-10-18 03:30:48 UTC as f24a0c5fdfd50f10b32da7a7d5748580de8f38ea, without admin bypass. Reviewed head, tested synthetic c405a28f7f56111b5da340616da37be57ce665ab and actual main have identical tree 3cf03d044d547a48606a82140757bd24c1f00c62. Fresh actual-main checks are running; issue56 deliberately remains open until they pass.

This PR does not authorize or perform a release, deployment or retry of the separately denied archive action. Breaking calendar/default-grid changes target 0.2, not the historical 0.1.7 patch.

AI assistance: Codex reviewed discussion and logs, reproduced failures, reconciled reference methods, implemented and reviewed these changes, and executed the stated checks. No independent human review is claimed.

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