feat: add interview-coach skill for full job search lifecycle coaching (#272)

* feat: add interview-coach skill for full job search lifecycle coaching

* fix: add missing Overview and Examples sections to interview-coach

---------

Co-authored-by: Dhiraj Bhat <dhiraj@unit21.ai>

skills/interview-coach/SKILL.md

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+---
+name: interview-coach
+description: "Full job search coaching system — JD decoding, resume, storybank, mock interviews, transcript analysis, comp negotiation. 23 commands, persistent state."
+category: productivity
+risk: safe
+source: community
+date_added: "2026-03-11"
+author: dbhat93
+tags: [interview, job-search, coaching, career, storybank, negotiation]
+tools: [claude]
+---
+
+# Interview Coach
+
+## Overview
+
+A persistent, adaptive coaching system for the full job search lifecycle.
+Not a question bank — an opinionated system that tracks your patterns,
+scores your answers, and gets sharper the more you use it. State persists
+in `coaching_state.md` across sessions so you always pick up where you left off.
+
+## Install
+
+```bash
+npx skills add dbhat93/job-search-os
+```
+
+Then type `/coach` → `kickoff`.
+
+## When to Use This Skill
+
+- Use when starting a job search and need a structured system
+- Use when preparing for a specific interview (company research, mock, hype)
+- Use when you want to analyze a past interview transcript
+- Use when negotiating an offer or handling comp questions on recruiter screens
+- Use when building or maintaining a storybank of interview-ready stories
+
+## What It Covers
+
+- **JD decoding** — six lenses, fit verdict, recruiter questions to ask
+- **Resume + LinkedIn** — ATS audit, bullet rewrites, platform-native optimization
+- **Mock interviews** — behavioral, system design, case, panel, technical formats
+- **Transcript analysis** — paste from Otter/Zoom/Grain, auto-detected format
+- **Storybank** — STAR stories with earned secrets, retrieval drills, portfolio optimization
+- **Comp + negotiation** — pre-offer scripting, offer analysis, exact negotiation scripts
+- **23 total commands** across the full search lifecycle
+
+## Examples
+
+### Example 1: Start your job search
+
+```
+/coach
+kickoff
+```
+
+The coach asks for your resume, target role, and timeline — then builds
+your profile and gives you a prioritized action plan.
+
+### Example 2: Prep for a specific company
+
+```
+/coach
+prep Stripe Senior PM
+```
+
+Runs company research, generates a role-specific prep brief, and queues
+up mock interview questions tailored to Stripe's process.
+
+### Example 3: Analyze an interview transcript
+
+```
+/coach
+analyze
+```
+
+Paste a raw transcript from Otter, Zoom, or any tool. The coach
+auto-detects the format, scores each answer across five dimensions,
+and gives you a drill plan targeting your specific gaps.
+
+### Example 4: Handle a comp question
+
+```
+/coach
+salary
+```
+
+Coaches you through the recruiter screen "what are your salary
+expectations?" moment with a defensible range and exact scripts.
+
+## Source
+
+https://github.com/dbhat93/job-search-os