Reduce the Atlassian skills to Jira, and fix eight broken modules

.claude/skills/atlassian-readonly-skills/PROVENANCE.md

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+# Provenance
+
+Vendored from **https://github.com/langpingxue/atlassian-skills**
+(`atlassian-readonly-skills/`), first committed here in d1a9bc66d.
+
+## License
+
+Upstream's README declares **MIT License**. Note two gaps in that declaration,
+recorded here so nobody has to rediscover them:
+
+- **Upstream ships no `LICENSE` file.** GitHub's license endpoint returns 404
+  for the repository, and there is no copyright line anywhere in it.
+- `SKILL.md`'s frontmatter says `license: Complete terms in LICENSE`, which is
+  therefore a dangling reference upstream as well as here. It is left unchanged
+  so this copy stays diffable against upstream.
+
+MIT permits use and modification; the attribution it asks for is this file.
+
+## Local modifications
+
+Keep these few and listed, so re-syncing upstream stays possible.
+
+1. **`SKILL.md`** gains a leading `## FieldWorks / SIL JIRA Integration`
+   section (~39 lines) covering `jira.sil.org`, the `LT` project key and the
+   Data Center specifics. Everything below it matches upstream.
+2. **`scripts/*.py` import fix.** Eight modules were unusable: they raised
+   `NameError: name 'Optional' is not defined` or
+   `NameError: name 'AtlassianCredentials' is not defined` on import, because
+   the read-only variant appears to be generated from the write variant by
+   stripping write functions, and the stripper also pruned those two names
+   from the import lines while the surviving signatures still referenced them.
+
+   Affected: `confluence_comments`, `confluence_labels`, `confluence_pages`,
+   `jira_agile`, `jira_links`, `jira_projects`, `jira_workflow`,
+   `jira_worklog`. The fix restores the pruned names, nothing else.
+
+   **Reported upstream as langpingxue/atlassian-skills#14.** Until it is fixed
+   there, a re-sync will reintroduce it.
+
+## Restructuring done here
+
+`SKILL.md` dropped its `## Available Utilities` section -- 237 lines restating
+all 48 function signatures that `REFERENCE.md` already documents in the same
+folder, copied from the write variant. It is now a module-to-function index
+generated from the scripts, with `REFERENCE.md` carrying the signatures. 560
+lines to 265.
+
+Only three sections proved byte-identical to the write variant and were safe to
+document once there: Response Data Structures, Error Handling, Dependencies.
+Configuration, Core Workflow and Philosophy differ -- the write variant's are
+supersets carrying write examples -- so the first two are kept here verbatim.
+
+This is the largest local divergence from upstream. A re-sync has to re-apply
+it, along with the import fix and the SIL section.
+
+## Jira only
+
+Confluence and Bitbucket were removed entirely on 2026-08-21. FieldWorks uses
+Jira and nothing else, and nothing in the repository referenced either.
+
+Removed: the eight `confluence_*` and `bitbucket_*` script modules, their
+documentation in `SKILL.md` and `REFERENCE.md`, their configuration blocks and
+credential fields, and their plumbing in `_common.py` -- the dataclass fields,
+`is_*_available` checks, `get_*_client` factories and the service branches in
+`AtlassianConfig.from_credentials`.
+
+This is a hard fork from upstream for these two skills. A re-sync is no longer
+a merge; treat upstream as a source to cherry-pick Jira fixes from.