feat: collect the services Jira issues link to, up to their latest change

[lesnik512]

Third step of the Jira phase: a report scoped to Jira issues.

What changes

• collect --jira KEY (repeatable, -j) reads the issues, then collects every GitLab project their remote links point to. It needs the Jira settings and cannot be combined with --group/--project; keys are validated against the Jira key pattern.
• Per project, rows run from the production baseline to the target: the newest row whose merge request or commit an issue links to. Rows above it are dropped; linked rows are marked (Row.linked).
• Each scoped service gets a release:
  • pending with tag: the nearest tag at or above the target (with its pipeline), or no tag when a new one is needed;
  • in_production: every linked merged MR is outside the range (below production);
  • not_merged: only open MRs link to the project;
  • not_found: nothing linked is in the range, or the walk was truncated.
    Open MRs are listed as pending_merge_requests; MRs merged into another branch become warnings.
• Row keys outside the scope are still read from Jira, so summaries, statuses and related services work as in group mode.
• A scope key Jira does not return exits 1 with Jira has no issue KEY.
• Page: title and intro name the issues, one line per issue, the Pending cell shows release <tag> or needs a new tag, ⏳ not merged / ⚠️ linked change not found need attention, 🎯 marks linked rows; in-production services collapse as up to date.
• Cache: prunes only within projects the run collected, so group and --jira runs share one file; merged MRs are cached as settled facts. Cache schema_version stays 1 (additive field).

Design notes

• The target is chosen by position in first-parent history, not merged_at.
• in_production requires an untruncated walk; with max_commits hit, the state is not_found rather than a false "deployed".
• A project whose path from the link cannot be read becomes a failed service with the GitLab error; it does not stop the run.
• The range walk moved into _walk, shared by both modes.