Promote button logic, delete confirmation, tooltips, and AGENTS.md conventions

U2 — Promote button three-state model:
- showPromote: visible only when a next promotion target exists
- canPromote: enabled only when deployed + no blocking gates
- promoteDisabledReason: tooltip explaining why promotion is disabled
- Added .rdp__btn--disabled style (opacity + pointer-events)

W1 — Script delete confirmation:
- Replace window.confirm() with app-confirm-dialog variant="danger"
- Names the script being deleted in the confirmation message

W2 — Script description tooltip:
- Add [title] binding to truncated description text in scripts table

V1 — Remove duplicate "Profile" h2 in User Preferences tab panel

X1 — Breadcrumb root "Ops" → "Operations" to match sidebar group label

AGENTS.md — Three new mandatory conventions:
- Destructive Action Convention: all deletes/revokes must use app-confirm-dialog
- Truncated Text Convention: all text-overflow:ellipsis elements must have [title]
- Promote Button Convention: three-state (hidden/disabled/enabled) model

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/Web/StellaOps.Web/AGENTS.md

@@ -87,6 +87,49 @@ Design and build the StellaOps web user experience that surfaces backend capabil
 - 4. Coordinate doc updates, tests, and cross-guild communication whenever contracts or workflows change.
 - 5. Revert to `TODO` if you pause the task without shipping changes; leave notes in commit/PR descriptions for context.
 
+## Destructive Action Convention (MANDATORY)
+
+All destructive actions (delete, revoke, purge, reset) **must** use `<app-confirm-dialog>` — never `window.confirm()` or unguarded inline handlers.
+
+**Rules:**
+- Every destructive button must open a styled `<app-confirm-dialog>` with `variant="danger"` before executing
+- The confirm dialog message must name the resource being destroyed (e.g., "Delete script 'Pre-deploy Health Check'?")
+- Include "This cannot be undone." or equivalent irreversibility warning when applicable
+- Never perform destructive API calls directly from a `(click)` handler without confirmation
+
+**Pattern:**
+```html
+<app-confirm-dialog #deleteConfirm
+  title="Delete Script"
+  [message]="'Delete script \\'' + item.name + '\\'? This cannot be undone.'"
+  confirmLabel="Delete" cancelLabel="Cancel" variant="danger"
+  (confirmed)="executeDelete()" />
+```
+
+## Truncated Text Convention (MANDATORY)
+
+All text that may be truncated by CSS (`text-overflow: ellipsis`, table cell overflow, or max-width constraints) **must** have a `[title]` attribute binding to the full untruncated text.
+
+**Rules:**
+- Table cells with descriptions, names, digests, or IDs that truncate must include `[title]="fullValue"`
+- Metric card labels already have `[title]="label"` (built into `stella-metric-card`) — do not add a second one
+- For dynamically computed truncation, prefer `[title]` over custom tooltip directives for simplicity and offline compatibility
+- Ensure tooltips are also applied to `<span>` and `<code>` elements inside table cells when they use `text-overflow: ellipsis`
+
+## Promote Button Convention (MANDATORY)
+
+The Promote button on release detail pages must follow a three-state model:
+
+1. **Hidden** — no further promotion path exists (single-environment release, or already at the final environment in the promotion graph)
+2. **Disabled** — promotion path exists but preconditions are not met:
+   - Release is not yet deployed on the current environment (status = `draft`)
+   - Blocking gates are unresolved
+   - Tooltip must explain why promotion is disabled
+3. **Enabled** — release is deployed, gates are clear, and a next environment exists
+
+Use `showPromote` (computed, boolean) for visibility and `canPromote` (computed, boolean) for the enabled/disabled state.
+Use `promoteDisabledReason` (computed, string | null) for the disabled tooltip.
+
 ## Metric / KPI Cards Convention (MANDATORY)
 
 All metric badges, stat cards, KPI tiles, and summary indicators **must** use `<stella-metric-card>`.