feat: integrate framework files into monorepo under packages/mosaic/framework/

Moves all Mosaic framework runtime files from the separate bootstrap repo
into the monorepo as canonical source. The @mosaic/mosaic npm package now
ships the complete framework — bin scripts, runtime configs, tools, and
templates — enabling standalone installation via npm install.

Structure:
  packages/mosaic/framework/
  ├── bin/          28 CLI scripts (mosaic, mosaic-doctor, mosaic-sync-skills, etc.)
  ├── runtime/      Runtime adapters (claude, codex, opencode, pi, mcp)
  ├── tools/        Shell tooling (git, prdy, orchestrator, quality, etc.)
  ├── templates/    Agent and repo templates
  ├── defaults/     Default identity files (AGENTS.md, STANDARDS.md, SOUL.md, etc.)
  ├── install.sh    Legacy bash installer
  └── remote-install.sh  One-liner remote installer

Key files with Pi support and recent fixes:
- bin/mosaic: launch_pi() with skills-local loop
- bin/mosaic-doctor: --fix auto-wiring for all 4 harnesses
- bin/mosaic-sync-skills: Pi as 4th link target, symlink-aware find
- bin/mosaic-link-runtime-assets: Pi settings.json patching
- bin/mosaic-migrate-local-skills: Pi skill roots, symlink find
- runtime/pi/RUNTIME.md + mosaic-extension.ts

Package ships 251 framework files in the npm tarball (278KB compressed).

packages/mosaic/framework/tools/git/issue-create.ps1

@@ -0,0 +1,80 @@
+# issue-create.ps1 - Create issues on Gitea or GitHub
+# Usage: .\issue-create.ps1 -Title "Title" [-Body "Body"] [-Labels "label1,label2"] [-Milestone "milestone"]
+
+[CmdletBinding()]
+param(
+    [Parameter(Mandatory=$true)]
+    [Alias("t")]
+    [string]$Title,
+
+    [Alias("b")]
+    [string]$Body,
+
+    [Alias("l")]
+    [string]$Labels,
+
+    [Alias("m")]
+    [string]$Milestone,
+
+    [Alias("h")]
+    [switch]$Help
+)
+
+$ScriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path
+. "$ScriptDir\detect-platform.ps1"
+
+function Show-Usage {
+    @"
+Usage: issue-create.ps1 [OPTIONS]
+
+Create an issue on the current repository (Gitea or GitHub).
+
+Options:
+    -Title, -t TITLE        Issue title (required)
+    -Body, -b BODY          Issue body/description
+    -Labels, -l LABELS      Comma-separated labels (e.g., "bug,feature")
+    -Milestone, -m NAME     Milestone name to assign
+    -Help, -h               Show this help message
+
+Examples:
+    .\issue-create.ps1 -Title "Fix login bug" -Labels "bug,priority-high"
+    .\issue-create.ps1 -t "Add dark mode" -b "Implement theme switching" -m "0.2.0"
+"@
+    exit 1
+}
+
+if ($Help) {
+    Show-Usage
+}
+
+$platform = Get-GitPlatform
+
+switch ($platform) {
+    "github" {
+        $cmd = @("gh", "issue", "create", "--title", $Title)
+        if ($Body) { $cmd += @("--body", $Body) }
+        if ($Labels) { $cmd += @("--label", $Labels) }
+        if ($Milestone) { $cmd += @("--milestone", $Milestone) }
+        & $cmd[0] $cmd[1..($cmd.Length-1)]
+    }
+    "gitea" {
+        $cmd = @("tea", "issue", "create", "--title", $Title)
+        if ($Body) { $cmd += @("--description", $Body) }
+        if ($Labels) { $cmd += @("--labels", $Labels) }
+        if ($Milestone) {
+            # Try to get milestone ID by name
+            $milestoneList = tea milestones list 2>$null
+            $milestoneId = ($milestoneList | Select-String "^\s*(\d+).*$Milestone" | ForEach-Object { $_.Matches.Groups[1].Value } | Select-Object -First 1)
+            if ($milestoneId) {
+                $cmd += @("--milestone", $milestoneId)
+            } else {
+                Write-Warning "Could not find milestone '$Milestone', creating without milestone"
+            }
+        }
+        & $cmd[0] $cmd[1..($cmd.Length-1)]
+    }
+    default {
+        Write-Error "Could not detect git platform"
+        exit 1
+    }
+}