…19601)

Previously, if you had a new license that would start before the current
one fully expired, you would get a warning. Now, the license validity
periods are merged together, and a warning is only generated based on
the end of the current contiguous period of license coverage.

Closes #19498

This change adds a DELETE endpoint for tasks (for now, alias of
workspace build delete transition).

Fixes coder/internal#903

This PR comprehensively updates the offline deployments documentation to
use more precise "air-gapped" terminology and improves consistency
throughout the documentation.

## Changes Made

### Terminology Updates
- **Title**: Changed from "Offline Deployments" to "Air-gapped
Deployments"
- **Summary**: Updated to prioritize "air-gapped" terminology and added
"disconnected" to cover additional deployment scenarios
- **Content**: Updated tutorial references to use "air-gapped" instead
of "offline"
- **Section headers**: 
  - Changed "Offline container images" to "Air-gapped container images"
  - Changed "Offline docs" to "Air-gapped docs"
- **Table headers**: Changed "Offline deployments" to "Air-gapped
deployments"

### Navigation & URL Structure
- **Navigation title**: Updated `docs/manifest.json` to show "Air-gapped
Deployments" in sidebar
- **Navigation description**: Updated to "Run Coder in air-gapped /
disconnected / offline environments"
- **File rename**: `docs/install/offline.md` → `docs/install/airgap.md`
for consistency
- **URL change**: `/install/offline` → `/install/airgap`
- **Subsection anchors**:
  - `/install/offline#offline-docs` → `/install/airgap#airgap-docs`
- `/install/offline#offline-container-images` →
`/install/airgap#airgap-container-images`

### Internal Links & References
Updated all internal documentation links:
- `docs/admin/integrations/index.md`
- `docs/admin/networking/index.md`
- `docs/changelogs/v0.27.0.md` (including anchor reference)
- `docs/tutorials/faqs.md`

### Backward Compatibility
- **Redirects**: Added `docs/_redirects` with 301 redirects:
  - `/install/offline` → `/install/airgap`
  - `/install/offline#offline-docs` → `/install/airgap#airgap-docs`
- `/install/offline#offline-container-images` →
`/install/airgap#airgap-container-images`
- **Content**: Maintains "offline" in the description for broader
understanding
- **Deep links**: All subsection anchors redirect properly to maintain
existing bookmarks

## Rationale

- **"Air-gapped"** is more precise and commonly used in
enterprise/security contexts
- **"Disconnected"** covers additional scenarios where networks may be
temporarily or partially isolated
- **Consistency** ensures filename, URL, navigation, content, and
subsection anchors all align with the same terminology
- **Backward compatibility** maintained through comprehensive redirects
to prevent broken links at any level

## Testing

- [x] Verified all internal links point to the new URL structure
- [x] Confirmed navigation title updates correctly
- [x] Ensured content accuracy is maintained
- [x] Added redirects for backward compatibility (main page +
subsections)
- [x] Updated all cross-references in related documentation
- [x] Verified subsection anchor redirects work properly
- [x] Confirmed no unnecessary .md file redirects

## Result

Complete terminology consistency across:
- ✅ Page title and headers
- ✅ Navigation and breadcrumbs  
- ✅ File names and URL structure
- ✅ Internal documentation links
- ✅ Table headers and section titles
- ✅ Subsection anchors and deep links
- ✅ Backward compatibility via comprehensive redirects

---------

Co-authored-by: blink-so[bot] <211532188+blink-so[bot]@users.noreply.github.com>
Co-authored-by: david-fraley <67079030+david-fraley@users.noreply.github.com>

…ic (#19641)

## Description

When creating a prebuilt workspace, both `flags.IsPrebuild` and
`flags.IsFirstBuild` are true. Previously, the logic rejected cases with
multiple flags, so `coderd_workspace_creation_duration_seconds` wasn’t
updated for prebuilt creations. This is the only valid scenario where
two flags can be true.

## Changes

* Fix logic to update `coderd_workspace_creation_duration_seconds`
metric for prebuilt workspaces.
* Add prebuild helper functions to coderdenttest (other prebuild tests
can reuse this).
* Update workspace's provisionerdmetric tests to include this metric.

Follow-up: #19503
Related to: #19528

…ce (#19637)

Relates to coder/internal#898

Refactor the `POST /api/experimental/tasks/{user}` endpoint to return a
codersdk.Task instead of a codersdk.Workspace

- Removes GetManagedAgentCount query
- Adds new table `usage_events_daily` which stores aggregated usage
events by the type and UTC day
- Adds trigger to update the values in this table when a new row is
inserted into `usage_events`
- Adds a migration that adds `usage_events_daily` rows for existing data
in `usage_events`
- Adds tests for the trigger
- Adds tests for the backfill query in the migration

Since the `usage_events` table is unreleased currently, this migration
will do nothing on real deployments and will only affect preview
deployments such as dogfood.

Closes coder/internal#943