Clarify the Pension Credit qualifying-age documentation

[juaristi22]

Refs #2162 (item 1 only).

Clarify the documentation for has_attained_state_pension_credit_qualifying_age: men born on 6 November 1953 reach the qualifying age and their own State Pension age at 65. This qualifies the general statement about men born before 6 December 1953. The existing formula, parameters and 6 October annual convention are retained.

The exception follows the same-birth-date rule in section 1(6) and the Pensions Act 1995 Schedule 4 timetable.

This addresses the documentation point only; #2162 remains open for its other follow-ups, which have separate work in #2358 and #2324.

Validation: the complete module AST matches main after excluding only the documentation value. Three existing qualifying-age regression checks passed; all 18 protected source, parameter, test and dependency files retain their original hashes. No new policy test or runtime correction is claimed. Independent policy/source and code reviews completed with no findings. Hosted CI will be checked after publication.

axiom: n/a: documentation metadata clarification; policy formulas, parameters and calculated eligibility are unchanged.

[vahid-ahmadi]

Looks right, fine to approve.

@juaristi22, the new wording is correct and the change is documentation only.

1. nit: changelog.d/2162.changed.md:1 starts with - . Item 3 of the same issue says towncrier's default template adds its own bullet, so this renders as - - . It matches what main and docs/engineering/skills/github-prs.md still do, so it is fine to leave until #2324 or item 3 settles the convention.

No must or should findings.

What I checked

• Pensions Act 1995 Sch 4 para 1 table 2 (as at 6 October 2016) on legislation.gov.uk: women born 6 November to 5 December 1953 reach pensionable age on 6 November 2018. SPCA 2002 s.1(6) ties the qualifying age to a woman born on the same day. So a man born on 6 November 1953 reaches the qualifying age on his 65th birthday. For every other birth date before 6 December 1953, the qualifying age falls before the 65th birthday. The new sentence states this correctly.
• Compared the module AST against main (62a0117f) with only the documentation value blanked: identical. No formula, parameter or test changes.
• ruff check and ruff format --check on the changed file: clean.
• Hosted CI on head 078a786e: all checks pass, including Test / Python 1-4, YAML, Lint, Docs build and Fix evidence.
• Fragment type changed fits a documentation change. The body says "Refs #2162 (item 1 only)", so the issue stays open for items 2 and 3.
• I did not run the test suite locally, as nothing executable changed.

🤖 Generated with Claude Code

[vahid-ahmadi]

Approving, per my review above. The shoulds and nits can follow.