Lower ADR-015 source-file cap from 600 to 500 lines (align with SonarCloud S104)

[Brad-Edwards]

Summary

Amend ADR-015 §2 to lower the non-test source-file cap from 600 lines to 500 lines, so the repo's documented file-size policy matches SonarCloud's S104 threshold (500). Today they disagree (ADR-015 = 600, Sonar S104 = 500), which lets files land in the 500–600 band that are repo-compliant but fail the SonarCloud quality gate at the dev → main integration PR (see #545, fixed by #560).

Scope

• Update ADR-015 (docs/decisions/adrs/adr-015-sdl-processor-layering-and-source-file-size-cap.md) §2 to state a 500-line cap.
• Update the enforcement in tools/policy/repo_policy.py (the 600 reference + _ADR015_INITIAL_OVERSIZED_FILES) and any related policy config (tools/policy/adr_policy.yaml, tools/policy/oversized_allowlist.yaml).
• Split (or allowlist, consistent with the ADR's allowlist-may-only-shrink rule) the source files now in the 500–599 band so the lowered cap is enforceable.

Rationale

A single threshold removes the integration-boundary surprise where Sonar flags files the repo policy permits.

[Brad-Edwards]

Picking this up via /quickfix on branch 561-lower-adr015-file-cap (off dev). ADR-015 §2 cap lowered 600→500; the _ADR015_INITIAL_OVERSIZED_FILES reference set and the allowlist are re-baselined to the files currently over 500 lines, so the lowered cap is immediately enforceable without a mass file-split.

[Brad-Edwards]

Quickfix close — issue #561 complete

PR: #749

Lowered the ADR-015 §2 non-test source-file cap from 600 to 500 lines to match SonarCloud's S104 threshold, closing the 500–599 band where files passed repo policy but failed the Sonar gate at the dev→main integration PR (#545). Re-baselined _ADR015_INITIAL_OVERSIZED_FILES and tools/policy/oversized_allowlist.yaml to the 25 files currently over 500 lines; the allowlist stays a subset of the code constant, so the shrink-only drain rule continues from the new baseline. Recorded an ADR-015 amendment and refreshed its acceptance pin (ADR-059). CI (full verify + docs), PR-title lint, and the SonarCloud quality gate are all green.

Files changed

Modified:

• docs/decisions/adrs/adr-015-sdl-processor-layering-and-source-file-size-cap.md
• docs/decisions/adrs/adr-index.yaml
• tools/policy/adr_policy.yaml
• tools/policy/repo_policy.py
• tools/policy/oversized_allowlist.yaml
• implementations/python/tests/test_repo_policy_tools.py

Status

• CI: ✅ green
• SonarCloud: ✅ passed
• PR ready for user review and merge.