fix(bitbucket): fail closed for removed cloud issues

docs/labels-and-capabilities.md

@@ -330,7 +330,7 @@ or a contract-free mix of substrates (e.g. `tools/spec-inventory` is
 | [`tools/egress-gateway`](../tools/egress-gateway/) | `substrate:sandbox` | Egress-allowlist forward proxy (proxy.py plugin); host-level egress chokepoint — defence-in-depth for RFC-AI-0003 §4.4 |
 | [`tools/container-gateway`](../tools/container-gateway/) | `substrate:sandbox` | Per-project policy proxy for the podman / docker API; label-scoped, mount- and privilege-checked container access from inside the sandbox |
 | [`tools/forwarder-relay`](../tools/forwarder-relay/) | `contract:report-relay` | Adapter contract for inbound-relay backends (ASF Security relay, huntr.com, HackerOne triagers). Pure interface spec; adapters declare detection + credit-extraction + reporter-addressing rules. |
-| [`tools/bitbucket`](../tools/bitbucket/) | `contract:change-request` + `contract:tracker` | Coverage: `partial`. Bitbucket Cloud and Bitbucket Data Center bridge foundation for repository metadata context, branch restriction context for PR-management decisions, pull-request discovery/fetching, read-only commit fetching, read-only diff fetching, comments-only discussion fetching, read-only review-state fetching, Cloud-only pull-request task listing/fetching, read-only merge-check context fetching, and read-only status fetching, plus narrowly scoped Cloud pull-request comment creation and approve/unapprove actions. Tracker coverage includes Cloud-only issue listing/fetching, issue comment fetching, issue attachment metadata fetching, and confirmed issue-comment creation. The `partial` qualifier means this tool implements named contract operations but does not satisfy the complete contract and must not be counted as a complete/selectable backend. Broader pull-request review/mutation, broader issue writes, and linked Jira handoff coverage remain incomplete. |
+| [`tools/bitbucket`](../tools/bitbucket/) | `contract:change-request` + `contract:tracker` | Coverage: `partial`. Bitbucket Cloud and Bitbucket Data Center bridge foundation for repository metadata context, branch restriction context for PR-management decisions, pull-request discovery/fetching, read-only commit fetching, read-only diff fetching, comments-only discussion fetching, read-only review-state fetching, Cloud-only pull-request task listing/fetching, read-only merge-check context fetching, and read-only status fetching, plus narrowly scoped Cloud pull-request comment creation and approve/unapprove actions. No `contract:tracker` operations are currently implemented: Atlassian removed the native Bitbucket Cloud Issue Tracker API on 2026-08-20 and Data Center native issues were never supported, so the historical issue CLI surface fails closed before any request and points callers to the Jira bridge (`tools/jira`); the label stays for the linked Jira handoff tracked in #606. The `partial` qualifier means this tool implements named contract operations but does not satisfy the complete contract and must not be counted as a complete/selectable backend. Linked Jira tracker handoff and remaining pull-request coverage remain incomplete. |
 | [`tools/forgejo`](../tools/forgejo/) | `contract:tracker` + `contract:source-control` + `contract:change-request` | Coverage: `partial`. Forgejo / Gitea REST API and `tea` CLI forge bridge foundation for issue listing/fetching, confirmed issue creation, body edits, comments, labels, and milestones under `contract:tracker`, git-backed branch/commit/push operations under `contract:source-control`, and pull-request creation via REST API / compare URL and label edits under `contract:change-request`. Project boards are unsupported (`no-op`) due to absence of REST card/column endpoints. The `partial` qualifier means this tool implements named contract operations but does not satisfy the complete contract and must not be counted as a complete/selectable backend. |
 | [`tools/fossil`](../tools/fossil/) | `contract:tracker` + `contract:source-control` | Fossil SCM forge bridge: integrates local SQLite-backed ticket tracking, wiki, and forum reads with the version-control shim |
 | [`tools/github`](../tools/github/) | `contract:tracker` + `contract:source-control` + `contract:change-request` + `contract:people` | GitHub REST / GraphQL tracker substrate (called by every lifecycle phase) plus the Git source-control binding documented in [`source-control.md`](../tools/github/source-control.md) (runnable backend in [`tools/vcs`](../tools/vcs/)), the pull-request review/merge gate (`change-request`; the ASF default backend, alongside `tools/jira-patch/` and `tools/mail-patch/` for SVN-first projects), and account profiles / collaborators / team membership (`people`) |