docs: describe worklog posting on Jira, Linear, and GitHub

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Summary

Document the new multi-provider worklog posting flow so users understand what "posting a worklog" means on each supported issue tracker and how to set up the required credentials.

Changes

• Jira guide — added a "What posting a worklog means on Jira" section explaining that worklogs land in the ticket's native Work Log tab via Jira's worklog REST API (Time Spent + comment), and clarified that the existing API token plus the standard "Work on issues" permission is all that's required.
• GitHub & Linear guide — explained up-front that neither tracker has a native time-tracking API, so a worklog is posted as a structured ⏱ Worklog comment on the matched issue (Linear via commentCreate, GitHub via the issue-comments REST endpoint). Added provider-specific "What posting a worklog means" sections showing the comment format, the machine marker, and where the entry shows up in each UI.
• GitHub token scopes — corrected the required scope: classic tokens need repo, fine-grained tokens need Issues: Read and write (read-only is no longer sufficient because the daemon now writes comments after approval). Clarified that GITHUB_ORG accepts an org slug or a personal username.
• Linear key handling — noted the personal API key is sent raw in the Authorization header (no Bearer prefix) and that LINEAR_TEAM_IDS accepts team keys like ENG,DESIGN.
• Dashboard guide — added a new Worklogs view section describing the shared draft → review → approve → post pipeline that powers all three providers, including the provider-specific final hop. Both tracker guides cross-link to it so the approval-gated flow is documented in one place.

Context

Source PR: Meridiona/meridian#102 — feat(worklog): Linear & GitHub worklog providers alongside Jira. Worklog posting now branches on a per-row provider snapshot taken at draft time, so the same approval gate and idempotency guarantees apply across Jira, Linear, and GitHub.

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