[v0.91.8][WP-20][csdlc-v2][validation] Remove sunset pr.sh guidance from owner lane

[danielbaustin]

Problem

The canonical C-SDLC owner validation lane still runs adl/tools/test_cli_owner_command_guidance.sh, which requires the sunset v1 command adl/tools/pr.sh run <issue>. Gate 10D2 and the root AGENTS.md define the independent typed v2 binaries as sole operational authority and prohibit the removed v1 lifecycle wrappers.

Evidence

Discovered while validating the #5455 remediation with:

bash adl/tools/run_owner_validation_lane.sh csdlc

The lane stopped at C-SDLC owner command guidance with:

FAIL: live command guidance is missing required command: adl/tools/pr.sh run <issue>

Focused Gate 10A passed 9/9 and strict all-target Clippy passed, so this is an unrelated stale validation-policy guard. Additional stale references are present in the guidance generator, compatibility tests, wrapper help, and tooling docs.

Required outcome

Align the live command-guidance generator, tests, wrapper/help surfaces, and owner validation lane with the final typed C-SDLC v2 authority. Do not restore or teach the removed v1 wrapper. Preserve historical evidence files as immutable history.

Acceptance criteria

• bash adl/tools/run_owner_validation_lane.sh csdlc no longer requires any sunset v1 lifecycle command.
• Live operator guidance resolves through csdlc-install resolve and the typed v2 binaries/skills.
• Active tests and generated guidance contain no instruction to invoke adl/tools/pr.sh run <issue> for C-SDLC lifecycle work.
• Historical evidence remains unchanged unless explicitly classified as active guidance.
• Focused guidance tests and the full C-SDLC owner lane pass.
• No AWS dependency or validation.

Scope boundary

This is separate from #5455 source-provenance remediation and must not block its focused acceptance proof.

v0.91.8 Routing Correction

• Parent track: WP-20 remediation, umbrella [v0.91.8][WP-20] Remediate review findings and run release preflight #5363.
• This is an independently owned C-SDLC tooling defect, not a WP-14A [v0.91.8][WP-14A] Integrated platform acceptance and deployment #5384 platform-acceptance child.