[Docs] Add Plugin Publishing Guide

PUBLISHING.md

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+# Publishing a New Version
+
+Use this when shipping a new Readwise Official Obsidian plugin version.
+
+Publishing has two separate steps:
+
+1. Merge a version-bump PR.
+2. Tag and publish the GitHub release.
+
+## 1. Create the Version-Bump PR
+
+Start from `master` and choose the new version:
+
+```sh
+VERSION=3.0.4
+git switch master
+git pull --ff-only
+git switch -c "release/$VERSION"
+```
+
+Update the version in all required places:
+
+```sh
+npm version "$VERSION" --no-git-tag-version
+```
+
+Then manually update:
+
+- `manifest.json`: set `version` to `$VERSION`
+- `versions.json`: add `$VERSION` with the supported Obsidian app version
+
+If the minimum Obsidian version did not change, copy the previous `versions.json` value.
+
+Run checks:
+
+```sh
+npm run ci
+```
+
+Open a PR containing only the version-bump files:
+
+- `package.json`
+- `package-lock.json`
+- `manifest.json`
+- `versions.json`
+
+Merge that PR before publishing.
+
+## 2. Tag the Merged Version
+
+After the version-bump PR is merged:
+
+```sh
+git switch master
+git pull --ff-only
+git tag "$VERSION"
+git push origin "$VERSION"
+```
+
+Pushing the tag starts the `Release Obsidian plugin` GitHub Action.
+
+## 3. Publish the Release
+
+The release workflow creates a draft GitHub release. Obsidian cannot install from a draft release.
+
+After the action succeeds, publish the release:
+
+```sh
+gh release edit "$VERSION" \
+  --repo readwiseio/obsidian-readwise \
+  --draft=false \
+  --latest
+```
+
+You can also publish it from the GitHub release page.
+
+## 4. Verify
+
+Make sure the assets Obsidian installs are public:
+
+```sh
+for asset in manifest.json main.js styles.css; do
+  curl -L -f -o /dev/null \
+    "https://github.com/readwiseio/obsidian-readwise/releases/download/$VERSION/$asset"
+done
+
+gh release list --repo readwiseio/obsidian-readwise --limit 3
+```
+
+The new release should show as `Latest`, not `Draft`.
+
+## If Obsidian Install Fails
+
+If Obsidian shows `Failed to install plugin` and the console has a 404, check:
+
+- the release is published, not draft
+- the tag matches `manifest.json` `version`
+- the release has `main.js`, `manifest.json`, and `styles.css`
+
+Useful command:
+
+```sh
+gh release view "$VERSION" \
+  --repo readwiseio/obsidian-readwise \
+  --json tagName,isDraft,publishedAt,assets \
+  --jq '.'
+```