style(quick-dev): normalize subagent spelling

Use subagent and subagents consistently across Quick Dev step files.

src/bmm-skills/4-implementation/bmad-quick-dev/step-01-clarify-and-route.md

@@ -59,8 +59,8 @@ If the spec is an epic story and `{sprint_status}` exists: find the `development
         - **If missing, empty, or invalid:** continue to step 3.
 
      3. **Compile epic context.** Produce `{implementation_artifacts}/epic-<N>-context.md` by following `./compile-epic-context.md`, in order of preference:
-        - **Preferred — sub-agent:** spawn a sub-agent with `./compile-epic-context.md` as its prompt. Pass it the epic number, the epics file path, the `{planning_artifacts}` directory, and the output path `{implementation_artifacts}/epic-<N>-context.md`.
+        - **Preferred — subagent:** spawn a subagent with `./compile-epic-context.md` as its prompt. Pass it the epic number, the epics file path, the `{planning_artifacts}` directory, and the output path `{implementation_artifacts}/epic-<N>-context.md`.
-        - **Fallback — inline** (for runtimes without sub-agent support, e.g. Copilot, Codex, local Ollama, older Claude): if your runtime cannot spawn sub-agents, or the spawn fails/times out, read `./compile-epic-context.md` yourself and follow its instructions to produce the same output file.
+        - **Fallback — inline** (for runtimes without subagent support, e.g. Copilot, Codex, local Ollama, older Claude): if your runtime cannot spawn subagents, or the spawn fails/times out, read `./compile-epic-context.md` yourself and follow its instructions to produce the same output file.
 
      4. **Verify.** After compilation, verify the output file exists, is non-empty, and starts with `# Epic <N> Context:`. If valid, load it. If verification fails, HALT and report the failure.
 

src/bmm-skills/4-implementation/bmad-quick-dev/step-02-plan.md

@@ -12,7 +12,7 @@ deferred_work_file: '{implementation_artifacts}/deferred-work.md'
 ## INSTRUCTIONS
 
 1. Draft resume check. If `{spec_file}` exists with `status: draft`, read it and capture the verbatim `<frozen-after-approval>...</frozen-after-approval>` block as `preserved_intent`. Otherwise `preserved_intent` is empty.
-2. Investigate codebase. _Isolate deep exploration in sub-agents/tasks where available. To prevent context snowballing, instruct subagents to give you distilled summaries only._
+2. Investigate codebase. _Isolate deep exploration in subagents/tasks where available. To prevent context snowballing, instruct subagents to give you distilled summaries only._
 3. Read `./spec-template.md` fully. Fill it out based on the intent and investigation. If `{preserved_intent}` is non-empty, substitute it for the `<frozen-after-approval>` block in your filled spec before writing. Write the result to `{spec_file}`.
 4. Self-review against READY FOR DEVELOPMENT standard.
 5. If intent gaps exist, do not fantasize, do not leave open questions, HALT and ask the human.

src/bmm-skills/4-implementation/bmad-quick-dev/step-03-implement.md

@@ -26,9 +26,9 @@ Change `{spec_file}` status to `in-progress` in the frontmatter before starting
 
 Follow `./sync-sprint-status.md` with `{target_status}` = `in-progress`.
 
-If `{spec_file}` has a non-empty `context:` list in its frontmatter, load those files before implementation begins. When handing to a sub-agent, include them in the sub-agent prompt so it has access to the referenced context.
+If `{spec_file}` has a non-empty `context:` list in its frontmatter, load those files before implementation begins. When handing to a subagent, include them in the subagent prompt so it has access to the referenced context.
 
-Hand `{spec_file}` to a sub-agent/task and let it implement. If no sub-agents are available, implement directly.
+Hand `{spec_file}` to a subagent/task and let it implement. If no subagents are available, implement directly.
 
 **Path formatting rule:** Any markdown links written into `{spec_file}` must use paths relative to `{spec_file}`'s directory so they are clickable in VS Code. Any file paths displayed in terminal/conversation output must use CWD-relative format with `:line` notation (e.g., `src/path/file.ts:42`) for terminal clickability. No leading `/` in either case.
 

src/bmm-skills/4-implementation/bmad-quick-dev/step-04-review.md

@@ -22,7 +22,7 @@ Do NOT `git add` anything — this is read-only inspection.
 
 ### Review
 
-Launch two subagents without conversation context. If no sub-agents are available, generate two review prompt files in `{implementation_artifacts}` — one per reviewer role below — and HALT. Ask the human to run each in a separate session (ideally a different LLM) and paste back the findings.
+Launch two subagents without conversation context. If no subagents are available, generate two review prompt files in `{implementation_artifacts}` — one per reviewer role below — and HALT. Ask the human to run each in a separate session (ideally a different LLM) and paste back the findings.
 
 - **Blind hunter** — receives inline `{diff_output}` only. No spec, no context docs, no project access. Invoke via the `bmad-review-adversarial-general` skill.
 - **Edge case hunter** — receives `{diff_output}` and read access to the project. Invoke via the `bmad-review-edge-case-hunter` skill.

src/bmm-skills/4-implementation/bmad-quick-dev/step-oneshot.md

@@ -19,7 +19,7 @@ Implement the clarified intent directly.
 
 ### Review
 
-Invoke the `bmad-review-adversarial-general` skill in a subagent with the changed files. The subagent gets NO conversation context — to avoid anchoring bias. Launch at the same model capability as the current session. If no sub-agents are available, write the changed files to a review prompt file in `{implementation_artifacts}` and HALT. Ask the human to run the review in a separate session and paste back the findings.
+Invoke the `bmad-review-adversarial-general` skill in a subagent with the changed files. The subagent gets NO conversation context — to avoid anchoring bias. Launch at the same model capability as the current session. If no subagents are available, write the changed files to a review prompt file in `{implementation_artifacts}` and HALT. Ask the human to run the review in a separate session and paste back the findings.
 
 ### Classify