> 🤖 This PR was written by Coder Agents on behalf of Jake Howell.

Backport of #28503 to `release/2.35`.

Refs
[DEVEX-736](https://linear.app/codercom/issue/DEVEX-736/template-editor-crashes-becomes-unusable-when-opening-versions).
This carries the Monaco diff-model lifecycle cleanup and Storybook
regression coverage into 2.35, preventing template-version navigation
from retaining models until the editor becomes unusable.

The cherry-pick conflict was limited to theme imports. The story uses
the release branch's Storybook canvas and theme conventions; the cleanup
behavior is unchanged from the original fix.

Co-authored-by: Marcin Tojek <mtojek@users.noreply.github.com>

Backport of #27273

Original PR: #27273 — fix: normalize path before rate-limit bucket
keying
Merge commit: de716f8
Requested by: @jdomeracki-coder

Co-authored-by: Bobby Ho <bobbidinho@gmail.com>
Co-authored-by: Marcin Tojek <mtojek@users.noreply.github.com>

…28963)

Backport of #28429

Original PR: #28429 — fix: prevent coderd crashes from unsupported
Tailnet RPCs
Merge commit: 156c8b6
PR created manually because the backport CI job is timing out.

)

Backport of #28746

Original PR: #28746 — fix(coderd/x/chatd): avoid closing poller hint
channels
Merge commit: ced03dc
Requested by: @ethanndickson

Backport of #29150 to `release/2.35`.

Reject missing lifecycle, startup, and metadata sub-messages with
`InvalidArgument` instead of panicking. Validate the entire metadata
batch before modifying or queuing values.

<details>
<summary>Backport context</summary>

Cherry-picks `9c58283d8e7a036a45820f76da7f05ffcf81d611` without changes.
The automatic backport failed while pushing the branch.

</details>

Generated by Coder Agents on behalf of @dylanhuff-at-coder.

…28074) (#29370)

Backport of #28074

Original PR: #28074 - perf(coderd): build the workspace build fan-out
maps once per batch
Merge commit: 62f4afb
Requested by: @jscottmiller

Opened manually because the backport workflow's push was rejected by
GitHub's workflow-scope check (run 34996286869). Cherry-pick applied
cleanly; `go build ./coderd/...` and `go test ./coderd -run
TestConvertWorkspaceBuild` pass on this branch. Addresses PLAT-386 /
#27205.

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Created with Coder Agents on behalf of @jscottmiller.