chore: added proposal to drop link validation

[klocke-io]

What this PR does / why we need it:
Adds openspec proposal to drop link validation
Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:
Best to read in the following order:

• openspec/changes/remove-link-validation/proposal.md
• openspec/changes/remove-link-validation/design.md
• openspec/changes/remove-link-validation/tasks.md

Release note:

NONE

[VelmiraS]

Thanks for the thorough write-up — the proposal, design, and tasks are all clear and well-structured. The SSRF angle is a good motivation for full removal rather than hardening.

A few thoughts:

On the breaking CLI flags:
The rationale makes sense given the feature is disabled everywhere.

On verification:
The approach is clear — run docforge before and after the change, hash the output, compare. If the hashes match, nothing broke.

One thing to watch out for: if any output file contains a timestamp like generated: 2026-05-21 15:30:00, the hashes will differ even if the actual content is identical — just because the time of the two runs is different. Worth checking for that before comparing.

Minor: openspec/config.yaml looks like a scaffolding/tooling
file — is it intentional to commit it to the repo, or is it gitignore-worthy?

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This pull-request has been approved by: VelmiraS
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