feat: add edgit tag bump command for semver automation

Adds a new subcommand to automatically bump semantic versions:
- `edgit tag bump <component> <major|minor|patch|prerelease>`
- Finds latest version tag and creates incremented version
- Supports --ref flag for specifying target Git ref
- Handles components with no existing tags (starts at v0.0.1)
- Full prerelease support (v1.0.0-alpha.1 → v1.0.0-alpha.2)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: maycotte

.changeset/add-tag-bump-command.md

@@ -0,0 +1,11 @@
+---
+"@ensemble-edge/edgit": patch
+---
+
+Add `edgit tag bump` command for automated semantic version bumping
+
+- New `edgit tag bump <component> <major|minor|patch|prerelease>` command
+- Automatically finds the latest version tag and creates a bumped version
+- Supports optional `--ref <ref>` to specify the Git ref for the new tag
+- Handles edge cases: components with no existing tags start at v0.0.1
+- Full semver support including prerelease increments (v1.0.0-alpha.1 → v1.0.0-alpha.2)

dist/commands/tag.d.ts

@@ -30,6 +30,20 @@ export declare class TagCommand extends Command {
     private listAllComponentTags;
     private getComponentTagData;
     private listComponentTags;
+    /**
+     * Bump version tag for a component
+     * Finds latest version and increments based on bump type
+     */
+    private bumpTag;
+    /**
+     * Bump a semver version string
+     */
+    private bumpVersion;
+    /**
+     * Compare two semver versions
+     * Returns negative if a < b, positive if a > b, 0 if equal
+     */
+    private compareSemver;
     private loadRegistry;
     getHelp(): string;
     private showHelp;